From sara(at-sign)math.mit.edu Fri Sep 4 13:37:41 1998 Return-Path: Received: from severi.mit.edu (SEVERI.MIT.EDU [18.87.0.68]) by math.mit.edu (8.8.7/8.8.7) with ESMTP id NAA03144 for ; Fri, 4 Sep 1998 13:37:41 -0400 (EDT) Received: (from sara(at-sign)localhost) by severi.mit.edu (8.8.7/8.6.9) id NAA20114; Fri, 4 Sep 1998 13:37:41 -0400 (EDT) Date: Fri, 4 Sep 1998 13:37:41 -0400 (EDT) From: Sara Billey Message-Id: <199809041737.NAA20114(at-sign)severi.mit.edu> To: combinatorics(at-sign)math.mit.edu Subject: September Schedule Dear Combinatorialists, The MIT Combinatorics Seminar will resume next week. The schedule for Septmeber is attached below. Abstracts have been posted and will be available on our web page soon: http://www-math.mit.edu/~combin Please let me know if you would like to speak this year in our seminar or if you would like to recommend someone else. Occasionally, we will also be advertising "pretalks" for nonexpert again this year. If anyone would like to be added or deleted from this list, just let me know. Welcome back, Sara Billey ************************************************************************ Wednesday September 9, 1998 * Margret Readdy (readdy(at-sign)math.cornell.edu) "Valuations and Complex Subspace Arrangements" Friday September 11, 1998 * Robert Donnelly (donnelly(at-sign)math.unc.edu) "Representations of semisimple Lie Algebras on Posets" Wednesday September 16, 1998 * Richard Ehrenborg (jrge(at-sign)math.cornell.edu) "Inequalities for the cd-index" Friday September 18, 1998 * Tentatively: Jennifer Morse Friday September 25, 1998 * Ezra Miller (enmiller(at-sign)math.berkeley.edu) "Alexander duality for monomial ideals and their resolutions" From kcollins(at-sign)mail.wesleyan.edu Sun Sep 6 10:43:19 1998 Return-Path: Received: from mail.wesleyan.edu (dns.wesleyan.edu [129.133.12.10]) by math.mit.edu (8.8.7/8.8.7) with ESMTP id KAA08354; Sun, 6 Sep 1998 10:43:19 -0400 (EDT) Received: from [129.133.30.205] (kcollins1.math.wesleyan.edu [129.133.30.205]) by mail.wesleyan.edu (8.8.6/8.7.3) with SMTP id KAA09933; Sun, 6 Sep 1998 10:40:56 -0400 (EDT) X-Sender: kcollins(at-sign)mail.wesleyan.edu Message-Id: Mime-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Date: Sun, 6 Sep 1998 10:43:03 -0400 To: kcollins(at-sign)mail.wesleyan.edu From: kcollins(at-sign)wesleyan.edu (Karen L. Collins) Subject: third announcement, Sept. 12th Come to the Thirty-first one day conference on Combinatorics and Graph Theory Saturday, September 12, 1998 10 a.m. to 4:30 p.m. at Smith College Northampton MA 01063 Schedule 10:00 Elizabeth McMahon (Lafayette College) TBA 11:10 Lowell Beineke (Indiana Univ. -- Purdue Univ. Fort Wayne) Creating and Destroying Cycles in Graphs and Digraphs 12:10 Lunch 2:00 Louis Billera (Cornell University) Flag Enumeration in Convex Polytopes 3:10 Kenneth Bogart (Dartmouth College) Trapezoid and Parallelogram Graphs and Orders The conferences are supported by an NSF grant which allows us to provide a modest transportation allowance to those attendees who are not local. We also gratefully acknowledge support from Smith College and Wesleyan University. Our Web page site has directions to Smith College, abstracts of speakers, dates of future conferences, and other information. The address is: http://math.smith.edu/~rhaas/coneweb.html Michael Albertson (Smith College), (413) 585-3865, albertson(at-sign)math.smith.edu Karen Collins (Wesleyan University), (860) 685-2169, kcollins(at-sign)wesleyan.edu Ruth Haas (Smith College), (413) 585-3872, rhaas(at-sign)math.smith.edu From fpsac99(at-sign)grec.upc.es Tue Sep 8 09:27:24 1998 Return-Path: Received: from grec.ma2.upc.es (grec.upc.es [147.83.52.3]) by math.mit.edu (8.8.7/8.8.7) with SMTP id JAA10690; Tue, 8 Sep 1998 09:23:21 -0400 (EDT) Received: from localhost by grec.ma2.upc.es (4.1/SMI-4.1) id AA25376; Tue, 8 Sep 98 14:18:32 +0200 Date: Tue, 8 Sep 1998 14:18:32 +0200 (MET DST) From: "\"FPSAC'99 Barcelona\"" To: mailfpsac(at-sign)grec.upc.es Subject: Call for papers (Latex file) Message-Id: Mime-Version: 1.0 Content-Type: MULTIPART/MIXED; BOUNDARY="1434849887-1500773637-905257112=:25364" This message is in MIME format. The first part should be readable text, while the remaining parts are likely unreadable without MIME-aware tools. 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-0400 (EDT) Received: from grec.upc.es (erdos.upc.es) by grec.ma2.upc.es (4.1/SMI-4.1) id AA01023; Wed, 9 Sep 98 11:55:35 +0200 Message-Id: <35F650E8.98DBEBF8(at-sign)grec.upc.es> Date: Wed, 09 Sep 1998 11:56:56 +0200 From: FPSAC99 X-Mailer: Mozilla 4.05 [en] (Win95; I) Mime-Version: 1.0 To: mailfpsac(at-sign)grec.upc.es Subject: Call for papers (Latex file) Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit Apologies if you already received this message: \documentstyle{article} \pagestyle{empty} \textheight=240mm \textwidth=170mm \footskip 1cm \voffset -38mm \hoffset -25mm \def\vtr#1{\vrule width 0mm depth 0mm height #1mm} \def\colitem#1{\bigskip\noindent{\large\bf #1} \medskip} % ************************************************************************ % ************************************************************************ \begin{document} \null \vskip -7mm \hbox to \textwidth{\hrulefill} \vskip 4mm \centerline{\Large\bf 11-i\`eme Colloque international} \vskip 2mm \centerline{\Large\bf S\'eries Formelles et Combinatoire Alg\'ebrique} \vskip 7mm \centerline{\Large\bf SFCA'99} \vskip 3mm \centerline{\large\bf 7 Juin -- 11 Juin 1999} \vskip 3mm \centerline{\large\bf UPC Barcelone (Espagne)} \vskip 3.5mm \vskip 3.5mm \hbox to \textwidth{\hrulefill} \vskip 3mm \centerline{\large Premi\`ere annonce -- Appel \`a communications} \vskip 2mm \hbox to \textwidth{\hrulefill} % ************************************************************************* \colitem{Th\`emes} \noindent Les th\`emes traditionnels du colloque sont la combinatoire alg\'ebrique et bijective dans leurs liens avec les math\'ematiques, l'informatique et la physique. \colitem{D\'eroulement de la conf\'erence} \noindent Le colloque comprend des conf\'erences invit\'ees de 60 minutes, des communications s\'electionn\'ees de 30 minutes, une s\'eance d'affichage de posters s\'elec\-tionn\'es, des d\'emonstrations de logiciels, et une session de probl\`emes. \colitem{Langues officielles} \noindent Les langues du colloque sont l'anglais et le fran\c cais. \colitem{Conf\'erenciers invit\'es confirm\'es} \noindent George Andrews (\'Etats unis), Miquel Angel Fiol (Espagne), Claire Kenyon (France), V\'\i{}ctor Neumann-Lara (Mexique), Cheryl Praeger (Australie), Arun Ram (\'Etats unis), Dominic Welsh (Anglaterre). \colitem{Soumissions de communications et de posters} \noindent Les auteurs qui d\'esirent soumettre un article sont invit\'es \`a faire parvenir un r\'esum\'e d\'etaill\'e avant le {\it 8 Novembre 1998}. La soumission se fera de pr\'ef\'erence par l'envoi d'{\it un\/} fichier postscript par email \`a\break {\tt fpsac99(at-sign)grec.upc.es}. Les auteurs incapables d'envoyer un fichier postscript de leur r\'esum\'e d\'etaill\'e sont pri\'es d'envoyer {\it quatre copies} d'un r\'esum\'e d\'etaill\'e de douze pages maximum \`a Marc Noy, Comit\'e de programme de SFCA'99, Universitat Polit\`ecnica de Catalunya, Pau Gargallo 5, 08028 Barcelone, ESPAGNE. \smallskip \noindent Les articles soumis devront comprendre un r\'esum\'e dans les deux langues officielles du colloque (les traductions seront fournies sur demande). Les auteurs sont pri\'es d'indiquer s'ils soumettent leur article \`a titre de communication ou de poster. Les notifications d'acceptation ou de refus sont pr\'evues pour F\'evrier 1999. %\smallskip %\noindent %Les auteurs dont les articles auront \'et\'e accept\'es pour une communication %ou un poster pourront soumettre une version compl\`ete de leur travail au %num\'ero sp\'ecial de la revue ``Discrete mathematics'' qui sera consacr\'e au %colloque SFCA'97. La date limite de soumission pour le num\'ero sp\'ecial %est fix\'ee au {\it 1er Septembre 1997}. \colitem{Session de probl\`emes ouverts} \noindent Les participants qui souhaitent pr\'esenter des probl\`emes ouverts sont invit\'es \`a envoyer leurs contributions avant le d\'ebut du colloque, si possible par courrier \'electronique \`a l'adresse {\tt fpsac99(at-sign)grec.upc.es}. %\pagebreak \colitem{D\'emonstrations de logiciels} \noindent Les d\'emonstrations de logiciels li\'es aux th\`emes du colloque sont vivement encourag\'ees. Les personnes souhaitant faire une d\'emonstration de logiciel sont invit\'ees \`a envoyer une courte description de leur logiciel, pr\'ecisant les supports mat\'eriels n\'ecessaires, avant le {\it 15 Janvier 1999}, par email a {\tt fpsac99(at-sign)grec.upc.es}. \pagebreak \colitem{Comit\'e de programme} \noindent La liste temporaire contient: Gert Almkvist (Suede), Helene Barcelo (\'Etats unis), Fran\c cois Bergeron (Canada), Robert Cori (France; Pr\'esident), Jean-Marc F\'edou (France), Kazuhizo Koike (Japon), Conrado Mart\'\i{}nez (Espagne), Alexander Mikhalev (Russie), Marc Noy (Espagne), Peter Paule (Autriche), Renzo Pinzani (Italie), Rodica Simion (\'Etats Unis), Oriol Serra (Espagne; Pr\'esident), Dennis Stanton (\'Etats unis), Sheila Sundaram (\'Etats unis), Jean-Yves Thibon (France), Volkmar Welker (Allemagne), Nick Wormald (Australia), Jiang Zeng (France). \colitem{Financement de d\'eplacements} \noindent Un nombre limit\'e de subventions (r\'eserv\'ees en priorit\'e aux \'etudiants et aux scientifiques des pays de l'Est) sera disponible pour pouvoir participer au colloque. Les demandes de subvention devront contenir l'avis d'une personnalit\'e scientifique et inclure les renseignements suivants~: montant des frais de transport et de s\'ejour, montant des autres sources de financement. Toute demande devra parvenir en {\it double exemplaire} avant le {\it 15 Janvier 1999} \`a Josep M. Brunat, Comit\'e d'organisation de SFCA'99, Universitat Polit\`ecnica de Catalunya, Pau Gargallo 5, 08028 Barcelone, ESPAGNE. \colitem{Lieu} \noindent La conf\'erence se d\'eroulera \`a l'{\it Escola d'Enginyeria Industrial de Barcelona} dans l'{\it Universitat Polit\`ecnica de Catalunya}. La premi\`ere conf\'erence est pr\'evue pour le 7 Juin 1999 \`a 9 heures. \colitem{Renseignements} \noindent Une page WWW, contenant les information les plus r\'ecents sur la conference, a \'et\'e cr\'e\'ee,\break {\tt http://www-ma2.upc.es/\~{}fpsac99}. Pour toute demande de renseignement sup\-pl\'e\-men\-taire, n'h\'esitez pas \`a \'ecrire \`a {\tt fpsac99(at-sign)grec.upc.es}. \colitem{Comit\'e d'organisation} \noindent Josep M. Brunat (UPC), Maylis Delest (U. de Bordeaux), Pilar Esqu\'e (UPC), Ferran Hurtado (UPC), Conrado Mart\'\i{}nez (UPC), Montserrat Maureso (UPC), Antonio Montes (UPC), Merc\`e Mora (UPC), Marc Noy (UPC; Pr\'esident) Jos\'e Luis Ruiz (UPC), Carlos Seara (UPC), Oriol Serra (UPC). % \colitem{Sponsors} % % \noindent % Le colloque SFCA'95 est soutenu par l'Universit\'e de Marne-la-Vall\'ee. % ************************************************************************** % ************************************************************************** \newpage \null \vskip -7mm \hbox to \textwidth{\hrulefill} \vskip 4mm \centerline{\Large\bf 11th International Conference on} \vskip 2mm \centerline{\Large\bf Formal Power Series and Algebraic Combinatorics} \vskip 7mm \centerline{\Large\bf FPSAC'99} \vskip 3mm \centerline{\large\bf June 7 -- 11, 1999} \vskip 3mm \centerline{\large\bf UPC Barcelona (Spain)} \vskip 3.5mm \vskip 3.5mm \hbox to \textwidth{\hrulefill} \vskip 3mm \centerline{\large First announcement -- Call for papers} \vskip 2mm \hbox to \textwidth{\hrulefill} % ************************************************************************* \colitem{Topics} \noindent Algebraic and bijective combinatorics and their relations with other parts of ma\-the\-matics, computer science and physics. \colitem{Conference program} \noindent Invited lectures, contributed presentations, poster session, problem session and software demonstrations. \colitem{Official languages} \noindent The official languages of the conference are English and French. \colitem{Confirmed Invited Speakers} \noindent George Andrews (USA), Miquel Angel Fiol (Spain), Claire Kenyon (France), V\'\i{}ctor Neumann-Lara (Mexico), Cheryl Praeger (Australia), Arun Ram (USA), Dominic Welsh (England). \colitem{Call for papers and posters} \noindent Authors are invited to submit extended abstracts of at most twelve pages before {\em November 8, 1998}. Preferred way of submission is by sending {\em one} postscript file by email to {\tt fpsac99(at-sign)grec.upc.es}. If an author is not able to send a postscript version of her/his extended abstract, four copies of the extended abstract should be mailed to Marc Noy, Program committee of FPSAC'99, Universitat Polit\`ecnica de Catalunya, Pau Gargallo 5, 08028 Barcelona, SPAIN. \smallskip \noindent The submitted papers should begin with a summary written in the two official languages of the conference (translations will be provided if necessary). Authors should indicate the mode of presentation which they consider appropriate for their paper: lecture or poster session. The notifications of acceptance or rejection are scheduled for February 1999. %\smallskip %\noindent %The authors whose papers will have been accepted for a lecture or a %poster presentation will have the possibility to submit a complete %version of their work to a special issue of the journal ``Discrete %Mathematics," devoted to the conference FPSAC '97. The deadline for %submission to the special issue is {\it September 1, 1997}. \colitem{Open problem session} \noindent Contributions to the problem session are invited in advance of the conference dates. If possible, problems should be submitted by e-mail to the address {\tt fpsac99(at-sign)grec.upc.es}. %\pagebreak \colitem{Software demonstrations} \noindent Demonstrations of software relevant to the topics of the conference are encouraged. People interested in giving a software demonstration should submit a paper as described above, including the hardware requirements, before {\it January 15, 1999}, by email to {\tt fpsac99(at-sign)grec.upc.es}. \pagebreak \colitem{Program committee} \noindent The temporary list contains: Gert Almkvist (Sweden), Helene Barcelo (USA), Fran\c cois Bergeron (Canada), Robert Cori (France; Chairman), Jean-Marc F\'edou (France), Kazuhizo Koike (Japan), Conrado Mart\'\i{}nez (Spain), Alexander Mikhalev (Russia), Marc Noy (Spain), Peter Paule (Austria), Renzo Pinzani (Italy), Rodica Simion (USA), Oriol Serra (Spain; Chairman), Dennis Stanton (USA), Sheila Sundaram (USA), Jean-Yves Thibon (France), Volkmar Welker (Germany), Nick Wormald (Australia), Jiang Zeng (France). \colitem{Participant support} \noindent Limited funds are available for partial support of participants, in particular for students and scientists from Eastern countries. Requests should contain a letter of recommendation and include the estimated transportation and living expenses as well as the amount of support available from other sources. All requests should be sent {\em in duplicate by January 15, 1999\/} to the following address: Josep M. Brunat, Organizing committee of FPSAC '99, Universitat Polit\`ecnica de Catalunya, Pau Gargallo 5, 08028 Barcelone, ESPAGNE. \colitem{Location} \noindent The conference will take place at the {\it Escola d'Enginyeria Industrial de Barcelona} in the {\it Universitat Polit\`ecnica de Catalunya}. The first talk is scheduled on June 7, 1999 at 9:00 a.m. \colitem{Further information} \noindent A WWW site {\tt http://www-ma2.upc.es/\~{}fpsac99} has been set up for the conference which will contain the latest state of affairs. For any further question, just write to {\tt fpsac99(at-sign)grec.upc.es}. \colitem{Organizing committee} \noindent Josep M. Brunat (UPC), Maylis Delest (Bordeaux U.), Pilar Esqu\'e (UPC), Ferran Hurtado (UPC), Conrado Mart\'\i{}nez (UPC), Montserrat Maureso (UPC), Antonio Montes (UPC), Merc\`e Mora (UPC), Marc Noy (UPC; Chairman) Jos\'e Luis Ruiz (UPC), Carlos Seara (UPC), Oriol Serra (UPC). \end{document} From sara(at-sign)math.mit.edu Wed Sep 9 10:18:34 1998 Return-Path: Received: from severi.mit.edu (SEVERI.MIT.EDU [18.87.0.68]) by math.mit.edu (8.8.7/8.8.7) with ESMTP id KAA17235 for ; Wed, 9 Sep 1998 10:18:33 -0400 (EDT) Received: (from sara(at-sign)localhost) by severi.mit.edu (8.8.7/8.6.9) id KAA01732; Wed, 9 Sep 1998 10:18:33 -0400 (EDT) Date: Wed, 9 Sep 1998 10:18:33 -0400 (EDT) Message-Id: <199809091418.KAA01732(at-sign)severi.mit.edu> From: Sara Billey To: combinatorics(at-sign)math.mit.edu Subject: seminar today X-URL: http://www-math.mit.edu/~sara Abstracts are now available at http://www-math.mit.edu/~combin *********Combinatorics Seminar Today at 4:15 in 2-338********** refreshments served at 3:45 Speaker: Margaret Readdy (Institute for Advanced Study) Email: readdy(at-sign)math.mit.edu (until September 18) Title: Valuations and Complex Subspace Arrangements We present a new combinatorial method to compute the characteristic polynomial of subspace arrangements using the theory of valuations. This method applies to any subspace arrangement over an infinite field. Examples include complex subspace arrangements, the Dowling divisor lattice and its interpolations. We also consider the effect of the Dowlingization transformation on the characteristic polynomial of real subspace arrangements. Upcoming Events: Friday September 11, 1998 * Robert Donnelly (donnelly(at-sign)math.unc.edu) "Representations of semisimple Lie Algebras on Posets" Wednesday September 16, 1998 * Richard Ehrenborg (jrge(at-sign)math.cornell.edu) "Inequalities for the cd-index" Friday September 18, 1998 * Jennifer Morse "Determinantal expressions for Macdonald polynomials" Friday September 25, 1998 * Ezra Miller (enmiller(at-sign)math.berkeley.edu) "Alexander duality for monomial ideals and their resolutions" Wednesday October 7, 1998 * Kimmo Eriksson (kimmo(at-sign)nada.kth.se) ******************************************* Sara Billey Assistant Professor of Applied Mathematics Massachusetts Institute of Technology Web page: http://www-math.mit.edu/~sara/ Room: 2-363c Phone: (617)-253-6544 ******************************************* From sara(at-sign)math.mit.edu Fri Sep 11 12:16:36 1998 Return-Path: Received: from severi.mit.edu (SEVERI.MIT.EDU [18.87.0.68]) by math.mit.edu (8.8.7/8.8.7) with ESMTP id MAA28696 for ; Fri, 11 Sep 1998 12:16:36 -0400 (EDT) Received: (from sara(at-sign)localhost) by severi.mit.edu (8.8.7/8.6.9) id MAA05356; Fri, 11 Sep 1998 12:16:35 -0400 (EDT) Date: Fri, 11 Sep 1998 12:16:35 -0400 (EDT) Message-Id: <199809111616.MAA05356(at-sign)severi.mit.edu> From: Sara Billey To: combinatorics(at-sign)math.mit.edu Subject: seminar today X-URL: http://www-math.mit.edu/~sara Combinatorics Seminar ** www-math.mit.edu/~combin Today at 4:15 in 2-338 Refreshments served at 3:45 Speaker: Robert Donnelly Email: donnelly(at-sign)math.mursuky.edu Title: Representations of semisimple Lie Algebras on Posets In this talk we'll describe one way to visualize the action of a semisimple Lie algebra on a weight basis. The resulting picture will actually be a poset with colored edges which we will call a {\em supporting diagram}. (Often, many weight bases give rise to the same supporting diagram.) Supporting diagrams have some notable combinatorial structure: in particular, for irreducible representations, they are always rank symmetric, rank unimodal, and strongly Sperner posets. Some well-known distributive lattices, such as the ``boolean lattice'' $B_{n}$ and the lattice $L(m,n)$ of all partitions that fit inside an $m \times n$ box, arise naturally as supporting diagrams for certain representations. In this talk we'll describe virtually all of the posets that we know of that arise as supporting diagrams for irreducible representations. However, this is a program that is far from complete; the problem is that many irreducible representations have not been explicitly constructed in such a way that it is possible to easily write down the supporting diagrams. We take as our model the explicit bases obtained by Gelfand and Zetlin for the irreducible representations of $sl(n,\Bbb{C})$. We will describe explicit bases (and the associated supporting diagrams) for the fundamental representations of $sp(2n,\Bbb{C})$ and $so(2n+1,\Bbb{C})$ that ``analogize'' the GZ bases in a certain sense. We will also look at supporting diagrams for other special families of representations. This talk will be example-oriented, and we will use these examples to begin to explore some more general questions. Does every supporting diagram contain the associated crystal graph? Which supporting diagrams are the most ``efficient''? And when is a weight basis``uniquely specified'' by its supporting diagram? Upcoming Events: Wednesday September 16, 1998 * Richard Ehrenborg (jrge(at-sign)math.cornell.edu) "Inequalities for the cd-index" Friday September 18, 1998 * Jennifer Morse "Determinantal expressions for Macdonald polynomials" Wednesday September 23, 1998 * Gil Kalai (kalai(at-sign)math.huji.ac.il) Title to be announced Friday September 25, 1998 * Ezra Miller (enmiller(at-sign)math.berkeley.edu) "Alexander duality for monomial ideals and their resolutions" Wednesday October 7, 1998 * Kimmo Eriksson (kimmo(at-sign)nada.kth.se) ******************************************* Sara Billey Assistant Professor of Applied Mathematics Massachusetts Institute of Technology Web page: http://www-math.mit.edu/~sara/ Room: 2-363c Phone: (617)-253-6544 ******************************************* From sara(at-sign)math.mit.edu Fri Sep 11 18:04:43 1998 Return-Path: Received: from severi.mit.edu (SEVERI.MIT.EDU [18.87.0.68]) by math.mit.edu (8.8.7/8.8.7) with ESMTP id SAA14511 for ; Fri, 11 Sep 1998 18:04:43 -0400 (EDT) Received: (from sara(at-sign)localhost) by severi.mit.edu (8.8.7/8.6.9) id SAA12085; Fri, 11 Sep 1998 18:04:43 -0400 (EDT) Date: Fri, 11 Sep 1998 18:04:43 -0400 (EDT) Message-Id: <199809112204.SAA12085(at-sign)severi.mit.edu> From: Sara Billey To: combinatorics(at-sign)math.mit.edu Subject: seminar overlap X-URL: http://www-math.mit.edu/~sara It has come to my attention that the Lie Groups Seminar on Wednesday might be of interest to some of you. Therefore, to avoid a conflict, Peter Trapa will speak in the Combinatorics Seminar on Friday, November 13 on the same material but with a combinatorial focus. >Wednesday September 16 >4:15 MIT Combinatorics Seminar: > "Inequalities for the cd-index" > Richard Ehrenborg (IAS) > MIT, Room 2-338 > >4:30 MIT Lie Groups Seminar: > "Robinson-Schensted algorithms for Lie groups > and a conjecture of Tanasaki's" > Peter Trapa (IAS) > MIT, Room 2-255 FOLLOWED BY DINNER ******************************************* Sara Billey Assistant Professor of Applied Mathematics Massachusetts Institute of Technology Web page: http://www-math.mit.edu/~sara/ Room: 2-363c Phone: (617)-253-6544 ******************************************* From sara(at-sign)math.mit.edu Wed Sep 16 09:47:31 1998 Return-Path: Received: from turing.mit.edu (TURING.MIT.EDU [18.87.0.21]) by math.mit.edu (8.8.7/8.8.7) with ESMTP id JAA16130 for ; Wed, 16 Sep 1998 09:47:31 -0400 (EDT) Received: (from sara(at-sign)localhost) by turing.mit.edu (8.8.8+Sun/8.8.7) id JAA06396; Wed, 16 Sep 1998 09:47:29 -0400 (EDT) Date: Wed, 16 Sep 1998 09:47:29 -0400 (EDT) Message-Id: <199809161347.JAA06396(at-sign)turing.mit.edu> From: Sara Billey To: combinatorics(at-sign)math.mit.edu Subject: seminar today X-URL: http://www-math.mit.edu/~sara Please note the seminar has been moved to 4:30 to allow people to attend the open house of the new math major's lounge. Combinatorics Seminar ** www-math.mit.edu/~combin Today at 4:30 in 2-338 Refreshments served at 3:45 Speaker: Richard Ehrenborg (Institute for Advanced Study) Email: jrge(at-sign)math.mit.edu (until 9/18/98) Title: Inequalities for the CD-Index We prove an inequality involving the cd-indices of a convex polytope P, a face F of the polytope and the link P/F. As a consequence we settle a conjecture of Stanley that the cd-index of d-dimensional polytopes is minimized on the d-dimensional simplex. Moreover, we show how this gives quadratic inequalities on the flag f-vector of polytopes. Lastly, we present an upper bound theorem for the cd-index of polytopes. Upcoming Events: Friday September 18, 1998 * Tentatively: Jennifer Morse Wednesday September 23, 1998 * Gil Kalai Friday September 25, 1998 * Ezra Miller (enmiller(at-sign)math.berkeley.edu) "Alexander duality for monomial ideals and their resolutions" Friday October 2, 1998 * Egon Schulte (schulte(at-sign)neu.edu) "Gr\"unbaum Dress polyhedra" Wednesday October 7, 1998 * Kimmo Eriksson (kimmo(at-sign)nada.kth.se) ******************************************* Sara Billey Assistant Professor of Applied Mathematics Massachusetts Institute of Technology Web page: http://www-math.mit.edu/~sara/ Room: 2-363c Phone: (617)-253-6544 ******************************************* From sara(at-sign)math.mit.edu Fri Sep 18 11:57:07 1998 Return-Path: Received: from turing.mit.edu (TURING.MIT.EDU [18.87.0.21]) by math.mit.edu (8.8.7/8.8.7) with ESMTP id LAA26402 for ; Fri, 18 Sep 1998 11:57:07 -0400 (EDT) Received: (from sara(at-sign)localhost) by turing.mit.edu (8.8.8+Sun/8.8.7) id LAA08085; Fri, 18 Sep 1998 11:57:06 -0400 (EDT) Date: Fri, 18 Sep 1998 11:57:06 -0400 (EDT) Message-Id: <199809181557.LAA08085(at-sign)turing.mit.edu> From: Sara Billey To: combinatorics(at-sign)math.mit.edu Subject: seminar today X-URL: http://www-math.mit.edu/~sara Combinatorics Seminar ** www-math.mit.edu/~combin Today at 4:15 in 2-338 Refreshments served at 3:45 Speaker: Jennifer Morse (UCSD) Email: jmorse(at-sign)math.uscd.edu Title: Determinantal expressions for Macdonald polynomials We show that the action of classical operators associated to the Macdonald polynomials on the basis of Schur functions, S_\lambda[X(t-1)/(q-1)], can be reduced to addition in \lambda rings. This provides explicit formulas for the Macdonald polynomials expanded in this basis as well as in the ordinary Schur basis, S_\lambda[X]. Upcoming events: Wednesday September 23, 1998 * Gil Kalai "Noise Sensitivity of Boolean Functions And Applications to Percolation" Friday September 25, 1998 * Ezra Miller (enmiller(at-sign)math.berkeley.edu) "Alexander duality for monomial ideals and their resolutions" Friday October 2, 1998 * Egon Schulte (schulte(at-sign)neu.edu) "Gr\"unbaum Dress polyhedra" ******************************************* Sara Billey Assistant Professor of Applied Mathematics Massachusetts Institute of Technology Web page: http://www-math.mit.edu/~sara/ Room: 2-363c Phone: (617)-253-6544 ******************************************* From sara(at-sign)math.mit.edu Wed Sep 23 10:25:00 1998 Return-Path: Received: from turing.mit.edu (TURING.MIT.EDU [18.87.0.21]) by math.mit.edu (8.8.7/8.8.7) with ESMTP id KAA04790 for ; Wed, 23 Sep 1998 10:25:00 -0400 (EDT) Received: (from sara(at-sign)localhost) by turing.mit.edu (8.8.8+Sun/8.8.7) id KAA14532; Wed, 23 Sep 1998 10:24:59 -0400 (EDT) Date: Wed, 23 Sep 1998 10:24:59 -0400 (EDT) Message-Id: <199809231424.KAA14532(at-sign)turing.mit.edu> From: Sara Billey To: combinatorics(at-sign)math.mit.edu Subject: seminar today X-URL: http://www-math.mit.edu/~sara Combinatorics Seminar ** www-math.mit.edu/~combin Today at 4:15 in 2-338 Refreshments served at 3:45 Speaker: Gil Kalai Email: kalai(at-sign)math.huji.ac.il Title: Noise Sensitivity of Boolean Functions And Applications to Percolation It is shown that a large class of events in a product probability space are highly sensitive to noise, in the sense that with high probability, the configuration with a few random errors gives almost no prediction whether the event occurs. This may be viewed as a concentration of measure phenomenon. Consider, for example, bond percolation on an $n+1$ by $n$ grid. A configuration is a function that assigns to every edge the value $0$ or $1$. Let $\omega$ be a random configuration, selected according to the uniform measure. A crossing is a path that joins the left and right sides of the rectangle, and consists entirely of edges $e$ with $\omega(e)=1$. By duality, the probability for having a crossing is $1/2$. Fix an $\epsilon\in(0,1)$. For each edge $e$, let $\omega'(e)=\omega(e)$ with probability $1-\epsilon$, and $\omega'(e)=1-\omega(e)$ with probability $\epsilon$, independently of the other edges. Let $p(\tau)$ be the probability for having a crossing in $\omega'$, conditioned on $\omega=\tau$. Then for all $n$ sufficiently large, $\mbox{Prob}\big\{\tau : |p(\tau)-1/2|>\epsilon\big\}<\epsilon$." Upcoming Events: Friday September 25, 1998 * Ezra Miller (enmiller(at-sign)math.berkeley.edu) "Alexander duality for monomial ideals and their resolutions" Friday October 2, 1998 * Egon Schulte (schulte(at-sign)neu.edu) "Gr\"unbaum Dress polyhedra" Wednesday October 7, 1998 * Michael Kleber (kleber(at-sign)math.mit.edu) Quadratic relations among characters Friday October 9, 1998 * Allen Knutson "The honeycomb model and regular ridgid honeycombs" Friday October 16, 1998 * Kimmo Eriksson (kimmo(at-sign)nada.kth.se) "Handcuffs and the TU roomate game" Wednesday October 21, 1998 * Henry Crapo (Henry.Crapo(at-sign)inria.fr) "On 'lacets' and their manifolds" Friday October 23, 1998 * Stephanie van Willigenburg (steph(at-sign)math.york.ca) ******************************************* Sara Billey Assistant Professor of Applied Mathematics Massachusetts Institute of Technology Web page: http://www-math.mit.edu/~sara/ Room: 2-363c Phone: (617)-253-6544 ******************************************* From rstan(at-sign)math.mit.edu Wed Sep 23 13:33:52 1998 Return-Path: Received: from macmahon.mit.edu (MACMAHON.MIT.EDU [18.87.0.200]) by math.mit.edu (8.8.7/8.8.7) with ESMTP id NAA11939 for ; Wed, 23 Sep 1998 13:33:52 -0400 (EDT) Received: (from rstan(at-sign)localhost) by macmahon.mit.edu (8.8.7/8.6.9) id NAA07650; Wed, 23 Sep 1998 13:33:52 -0400 (EDT) Date: Wed, 23 Sep 1998 13:33:52 -0400 (EDT) Message-Id: <199809231733.NAA07650(at-sign)macmahon.mit.edu> From: Richard Stanley To: combinatorics(at-sign)math.mit.edu Subject: dinner tonight There will be a dinner for Gil Kalai after his talk today in the MIT Combinatorics Seminar. Anyone wishing to attend should just hang around after his talk. The restaurant will be decided after the talk. Richard From iarrobin(at-sign)neu.edu Thu Sep 24 14:46:40 1998 Return-Path: Received: from NUHUB.DAC.NEU.EDU (nuhub.dac.neu.edu [129.10.1.6]) by math.mit.edu (8.8.7/8.8.7) with ESMTP id OAA15186; Thu, 24 Sep 1998 14:46:40 -0400 (EDT) Received: from [155.33.184.186] by neu.edu (PMDF V5.1-8 #D3123) with ESMTP id <01J26SMRSMIO986WD8(at-sign)neu.edu>; Thu, 24 Sep 1998 14:46:34 EST Date: Thu, 24 Sep 1998 14:47:33 -0400 From: "a. Iarrobino" Subject: Of possible interest X-Sender: iarrobin(at-sign)neu.edu (Unverified) To: combinatorics(at-sign)math.mit.edu Cc: alexsuciu(at-sign)neu.edu, schulte(at-sign)neu.edu, iarrobin(at-sign)neu.edu, sara(at-sign)math.mit.edu, schenck(at-sign)cam.cornell.edu Message-id: MIME-version: 1.0 Content-type: text/plain; charset="us-ascii" Northeastern GASC (Geometry-Algebra-Singularities-Combinatorics) Seminar, Monday Sept 28 at 1:30 PM in 509 Lake Hall: Hal Schenck (Northeastern) "The Chern polynomial of a three arrangement" \abstract: {\noindent I'll begin with a quick introduction to Hyperplane Arrangements (Intersection Lattice, Mobius function, Poincare polynomial, the module of {\cal A}-derivations). I will then prove that the Poincare polynomial $\pi({\cal A},t)$ of a (central) three arrangement ${\cal A}$ is $(1+t)$ times the Chern polynomial of the sheaf associated to the dual of the kernel of the Jacobian of ${\cal A}$. I'll also prove that if ${\cal A}$ is a (central) three arrangement, then this sheaf is a vector bundle on ${\bf P}^2$, and describe an algorithm which computes $\pi({\cal A},t)$ from a free resolution of the Jacobian of ${\cal A}$.} __ For further talks/abstracts see the GASC Seminar website: www.math.neu.edu/~suciu/gas/ _____ Future talks, Fall 98. Oct 5: Allen Knutson (Brandeis) "Positivity of Littlewood-Richardson coefficients, and the combinatorics of `honeycombs'" Oct 12: Columbus day - no seminar Oct. 19: Anatoly Libgover (Univ. of Illinois at Chicago) Oct. 26 Gene Cooperman (Northeastern, Comp. Science) "A Casual Tour through Computational Permutation Group Theory" Nov. 2. Alexander Klyachko (Bilkent) Nov. 9 Richard Weiss (Tufts) Nov. 16 Sara Billey (MIT) Nov. 23 Carol Chang (Northeastern) (Organizers: Alex Suciu, Egon Schulte, A. Iarrobino) From sara(at-sign)math.mit.edu Wed Sep 30 11:51:46 1998 Return-Path: Received: from turing.mit.edu (TURING.MIT.EDU [18.87.0.21]) by math.mit.edu (8.8.7/8.8.7) with ESMTP id LAA04404 for ; Wed, 30 Sep 1998 11:51:45 -0400 (EDT) Received: (from sara(at-sign)localhost) by turing.mit.edu (8.8.8+Sun/8.8.7) id LAA03502; Wed, 30 Sep 1998 11:51:44 -0400 (EDT) Date: Wed, 30 Sep 1998 11:51:44 -0400 (EDT) Message-Id: <199809301551.LAA03502(at-sign)turing.mit.edu> From: Sara Billey To: combinatorics(at-sign)math.mit.edu Subject: NO seminar today X-URL: http://www-math.mit.edu/~sara There is no Combinatorics Seminar scheduled for today, however every other day this semester is already booked. Below is the schedule of speakers and titles if available. The entire schedule is also on the web. Abstracts will be put on the web as soon as I receive them. Enjoy your afternoon off. Friday October 2, 1998 * Egon Schulte (schulte(at-sign)neu.edu) "Gr\"unbaum Dress polyhedra" Wednesday October 7, 1998 * Alexander Postnikov "Littlewood-Richarson Coefficients via Yang-Baxter Equations" Friday October 9, 1998 * Allen Knutson "The honeycomb model and regular ridgid honeycombs" Wednesday October 14, 1998 * Michael Kleber (kleber(at-sign)math.mit.edu) "Quadratic relations among characters" Joint with Lie Groups Seminar Friday October 16, 1998 * Kimmo Eriksson (kimmo(at-sign)nada.kth.se) "Handcuffs and the TU roomate game" Wednesday October 21, 1998 * Henry Crapo (Henry.Crapo(at-sign)inria.fr) "On 'lacets' and their manifolds" Friday October 23, 1998 * Stephanie van Willigenburg (steph(at-sign)math.york.ca) "A matrix interpretation for the descent algebra of type D" Wednesday October 28, 1998 * Harm Derksen (hderksen(at-sign)math.mit.edu) "Generalized quivers associated to reductive groups" Joint with Lie Groups Seminar Friday October 30, 1998 * Miklos Bona "Enumerating colored cacti" Wednesday November 4, 1998 * Donniell Fishkind (fishkind(at-sign)brutus.mts.jhu.edu) Friday November 6, 1998 * Tim Chow (tchow(at-sign)alum.mit.edu) "How much about sieves and zeta functions can we steal from number theory" aka "A half dozen, half baked ideas" Wednesday November 11, 1998 * Veterans' Day Friday November 13, 1998 * Peter Trapa Wednesday November 18, 1998 * Andreas Dress (dress(at-sign)chs1ce.engr.ccny.cuny.edu) Friday November 20, 1998 * Geza Toth (toth(at-sign)math.mit.edu) Wednesday November 25, 1998 * Thanksgiving Vacation Friday November 27, 1998 * Thanksgiving Vacation Wednesday December 2, 1998 * Sheilda Sundaram (sheila(at-sign)claude.math.wesleyan.edu) Friday December 4, 1998 * fomin(at-sign)math.mit.edu "Recognizing Schubert Cells" ******************************************* Sara Billey Assistant Professor of Applied Mathematics Massachusetts Institute of Technology Web page: http://www-math.mit.edu/~sara/ Room: 2-363c Phone: (617)-253-6544 ******************************************* From IARROBIN(at-sign)neu.edu Wed Sep 30 12:53:38 1998 Return-Path: Received: from NUHUB.DAC.NEU.EDU (nuhub.dac.neu.edu [129.10.1.6]) by math.mit.edu (8.8.7/8.8.7) with ESMTP id MAA06767 for ; Wed, 30 Sep 1998 12:53:38 -0400 (EDT) From: IARROBIN(at-sign)neu.edu Received: from neu.edu by neu.edu (PMDF V5.1-8 #D3123) id <01J2F2BLNNWW988TSV(at-sign)neu.edu> for combinatorics(at-sign)math.mit.edu; Wed, 30 Sep 1998 12:53:33 EST Date: Wed, 30 Sep 1998 12:53:32 -0500 (EST) Subject: of possible interest To: combinatorics(at-sign)math.mit.edu Message-id: <01J2F2BLNXKI988TSV(at-sign)neu.edu> X-VMS-To: IN%"combinatorics(at-sign)math.mit.edu" MIME-version: 1.0 GASC talk at Northeastern, Monday Oct 5, at 1:30 PM in 509 Lake Hall Allen Knutson (Brandeis) "Positivity of Littlewood-Richardson coefficients, and the combinatorics of 'honeycombs'" _____ For further info/abstract see the GASC website at www.math.neu.edu/~suciu/gas [Organizers: Alex Suciu, Egon Schulte, Tony Iarrobino] From kcollins(at-sign)mail.wesleyan.edu Fri Oct 2 10:13:29 1998 Return-Path: Received: from mail.wesleyan.edu (mail.wesleyan.edu [129.133.1.51]) by math.mit.edu (8.8.7/8.8.7) with ESMTP id KAA04588; Fri, 2 Oct 1998 10:13:28 -0400 (EDT) Received: from [129.133.30.205] (kcollins1.math.wesleyan.edu [129.133.30.205]) by mail.wesleyan.edu (8.8.6/8.7.3) with SMTP id KAA25708; Fri, 2 Oct 1998 10:12:52 -0400 (EDT) X-Sender: kcollins(at-sign)mail.wesleyan.edu Message-Id: Mime-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Date: Fri, 2 Oct 1998 10:13:57 -0400 To: kcollins(at-sign)mail.wesleyan.edu From: kcollins(at-sign)wesleyan.edu (Karen L. Collins) Subject: CoNE meeting Come to the Thirty-second one day conference on Combinatorics and Graph Theory Saturday, October 24, 1998 10 a.m. to 4:30 p.m. at Smith College Northampton MA 01063 Schedule 10:00 Lixin Gao (Smith College) Providing Video-on-Demand Services for Popular Videos 11:10 Karen Seyffarth (University of Calgary) Constructions of Large Planar Graphs with Given Diameter and Maximum Degree 12:10 Lunch 2:00 Stephen Ryan (Dartmouth College) Distinguishing Geometric Classes of Trapezoid Orders 3:10 Randy Shull (Wellesley College) A Polynomial Time Recognition Algorithm for Totally Bounded Bitolerance Digraphs The conferences are supported by an NSF grant which allows us to provide a modest transportation allowance to those attendees who are not local. We also gratefully acknowledge support from Smith College and Wesleyan University. Our Web page site has directions to Smith College, abstracts of speakers, dates of future conferences, and other information. The address is: http://math.smith.edu/~rhaas/coneweb.html Michael Albertson (Smith College), (413) 585-3865, albertson(at-sign)math.smith.edu Karen Collins (Wesleyan University), (860) 685-2169, kcollins(at-sign)wesleyan.edu Ruth Haas (Smith College), (413) 585-3872, rhaas(at-sign)math.smith.edu From kcollins(at-sign)mail.wesleyan.edu Fri Oct 2 10:15:48 1998 Return-Path: Received: from mail.wesleyan.edu (dns.wesleyan.edu [129.133.12.10]) by math.mit.edu (8.8.7/8.8.7) with ESMTP id KAA04655; Fri, 2 Oct 1998 10:15:48 -0400 (EDT) Received: from [129.133.30.205] (kcollins1.math.wesleyan.edu [129.133.30.205]) by mail.wesleyan.edu (8.8.6/8.7.3) with SMTP id KAA26345; Fri, 2 Oct 1998 10:15:41 -0400 (EDT) X-Sender: kcollins(at-sign)mail.wesleyan.edu Message-Id: Mime-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Date: Fri, 2 Oct 1998 10:16:23 -0400 To: kcollins(at-sign)mail.wesleyan.edu From: kcollins(at-sign)wesleyan.edu (Karen L. Collins) Subject: GTD XXXVI =========================================================== The Mathematics Section of THE NEW YORK ACADEMY OF SCIENCES will sponsor GRAPH THEORY DAY THIRTY SIX A one day meeting to stimulate activity among graph theorists hosted by the Department of Mathematics, College of Staten Island, CUNY Saturday November 7, 1998 10:00 a.m. - 4:30 p.m. INVITED SPEAKERS (Abstracts are below) Michael O. Albertson Mathematics Department, Smith College, Northampton, Mass. "Sometimes You Don't Need Extra Colors" Linda Lesniak Department of Mathematics and Computer Science Drew University, Madison, New Jersey "Partitioning the Vertices of a Graph into Cycles" The Program will include time for informal exchange of graph theory information, announcements, and short contributions to a Graph Theory Notes Session. Written contributions will be considered for inclusion in Graph Theory Notes of New York. PLACE College of Staten Island, CUNY, Staten Island, NY 10314 2800 Victory Boulevard, near I-278 (Staten Isl Expressway) Center for the Arts (Building 1P), Recital Hall Telephone: 718-982-2000 (main), 718-982-2111 (security) REGISTRATION FEE: $25. Students with current school ID: $15. (Registration includes continental breakfast, lunch, and $5 contribution to the NYAS Graph Theory Fund). NOTE: Lunch can be guaranteed only for advance registrants. Please make check payable to "CSI Foundation - Graph Theory Day" and send to checks/registration info (name, address, phone, email) to: Aru Raychaudhuri Department of Mathematics, 1S-215 College of Staten Island 2800 Victory Blvd. Staten Island, NY 10314 FURTHER INFORMATION: General information: Deborah Franzblau Dept of Mathematics, College of Staten Island, 718/982-3629 To contribute a title/abstract for the Graph Theory Notes session contact on the meeting day or by email in advance: John W. Kennedy or Louis V. Quintas WWW page: http://www.nyas.org/math.htm ORGANIZING COMMITTEE Deborah S. Franzblau and Aru Raychaudhuri (College of Staten Island, CUNY) John W. Kennedy (K-M Research) and Louis V. Quintas (Pace University) ------------------------------------------------------------ ABSTRACTS OF INVITED TALKS Linda Lesniak: Partitioning the Vertices of a Graph into Cycles A classic result of Dirac states that if every vertex of a graph G of order n has degree at least n/2, then G is Hamiltonian. This minimum degree condition, then, is a sufficient condition for a graph G to have a partition of its vertices into exactly one cycle (i.e., a 2-factor with exactly one cycle). When can the vertices of G be partitioned into exactly two disjoint cycles? Exactly three cycles? Exactly two cycles of specified lengths? This talk will survey sufficient conditions for graphs to have properties of this kind. ------------------------------------------------------------ Michael O. Albertson: Sometimes You Don't Need Extra Colors Suppose that G is an r-colorable graph and P is a set of precolored vertices: when does an r-coloring of P extend to an r-coloring of G? If G is a planar graph and the vertices of P are pairwise far apart, then a 4-coloring of P might not extend to a 4-coloring of G, but it will extend to a 5-coloring of G. In general, if G is r-colorable and the distance between any two vertices in P is at least 4, then any (r+1)-coloring of P extends to an (r+1)-coloring of all of G. For arbitrary r-colorable graphs, there is no r-color extension theorem--- one that does not require an extra color. However, there are well- known families of graphs which do have extension theorems requiring no additional colors. Recent work with Emily Moore is beginning to shed light on sufficient conditions for this to happen. This talk will consist of an introduction to the graph color extension problem, a brief survey of past highlights, a taste of current work, and a glimpse of what the future might bring. =============================================================== Deborah S. Franzblau franzblau(at-sign)postbox.csi.cuny.edu Dept. of Mathematics 718-982-3629 CUNY/CSI fax: 718-982-3631 Staten Island, NY 10314 =============================================================== From sara(at-sign)math.mit.edu Fri Oct 2 11:31:07 1998 Return-Path: Received: from turing.mit.edu (TURING.MIT.EDU [18.87.0.21]) by math.mit.edu (8.8.7/8.8.7) with ESMTP id LAA08333 for ; Fri, 2 Oct 1998 11:31:07 -0400 (EDT) Received: (from sara(at-sign)localhost) by turing.mit.edu (8.8.8+Sun/8.8.7) id LAA06390; Fri, 2 Oct 1998 11:31:05 -0400 (EDT) Date: Fri, 2 Oct 1998 11:31:05 -0400 (EDT) Message-Id: <199810021531.LAA06390(at-sign)turing.mit.edu> From: Sara Billey To: combinatorics(at-sign)math.mit.edu Subject: seminar today Comments: Hyperbole mail buttons accepted, v04.023. X-URL: http://www-math.mit.edu/~sara Combinatorics Seminar ** www-math.mit.edu/~combin Today at 4:15 in 2-338 Refreshments served at 3:45 Speaker: Egon Schulte (Northeastern University) Email: schulte(at-sign)neu.edu Title: The Gr\"unbaum--Dress Polyhedra Regular polyhedra have been investigated since antiquity. In ordinary euclidean 3-space, the class of regular polyhedra has been considerably extended to what are now called the Gr\"unbaum--Dress polyhedra. The talk presents a new approach to these polyhedra, which also leads to a quicker proof of the completeness of the enumeration than that found by Dress. Presentations of their symmetry groups will also be discussed. This is joint work with Peter McMullen. Upcoming Events: Wednesday October 7, 1998 * Alexander Postnikov "Littlewood-Richarson Coefficients via Yang-Baxter Equations" Friday October 9, 1998 ** 4:30 ** due to departmental party * Allen Knutson "The honeycomb model and regular ridgid honeycombs" Wednesday October 14, 1998 * Michael Kleber (kleber(at-sign)math.mit.edu) "Quadratic relations among characters" Joint with Lie Groups Seminar Friday October 16, 1998 * Kimmo Eriksson (kimmo(at-sign)nada.kth.se) "Handcuffs and the TU roomate game" Wednesday October 21, 1998 * Henry Crapo (Henry.Crapo(at-sign)inria.fr) "On 'lacets' and their manifolds" Friday October 23, 1998 * Stephanie van Willigenburg (steph(at-sign)math.york.ca) "A matrix interpretation for the descent algebra of type D" Wednesday October 28, 1998 * Harm Derksen (hderksen(at-sign)math.mit.edu) "Generalized quivers associated to reductive groups" Joint with Lie Groups Seminar Friday October 30, 1998 * Miklos Bona "Enumerating colored cacti" ******************************************* Sara Billey Assistant Professor of Applied Mathematics Massachusetts Institute of Technology Web page: http://www-math.mit.edu/~sara/ Room: 2-363c Phone: (617)-253-6544 ******************************************* From sara(at-sign)math.mit.edu Wed Oct 7 13:41:07 1998 Return-Path: Received: from turing.mit.edu (TURING.MIT.EDU [18.87.0.21]) by math.mit.edu (8.8.7/8.8.7) with ESMTP id NAA11327 for ; Wed, 7 Oct 1998 13:41:07 -0400 (EDT) Received: (from sara(at-sign)localhost) by turing.mit.edu (8.8.8+Sun/8.8.7) id NAA11592; Wed, 7 Oct 1998 13:41:05 -0400 (EDT) Date: Wed, 7 Oct 1998 13:41:05 -0400 (EDT) Message-Id: <199810071741.NAA11592(at-sign)turing.mit.edu> From: Sara Billey To: combinatorics(at-sign)math.mit.edu Subject: seminar today Comments: Hyperbole mail buttons accepted, v04.023. X-URL: http://www-math.mit.edu/~sara Combinatorics Seminar ** www-math.mit.edu/~combin Today at 4:15 in 2-338 Refreshments served at 3:45 Speaker: Alexander Postnikov Email: apost(at-sign)math.mit.edu Title: Littlewood-Richardson Coeffients via Yang-Baxter Equations The purpose of this talk is to present a combinatorial interpretation for the decomposition of the tensor product of two or more irreducible representations of GL(n) in terms of certain scattering R-matrix. This R-matrix satisfies a Yang-Baxter type equation. The corresponding piecewise-linear transformation of parameters maps coincide with the transition maps for Kashiwara parametrizations of canonical bases for modules over type A quantum groups. We provide an explicit description for the cone of such parameterizations, thus solving a problem posed by Berenstein and Zelevinsky. Geometrically, our R-matrix can be interpreted via certain web diagrams, which are similar in appearance to honeycomb tinkertoys of Knutson and Tao. This is a joint work with Oleg Gleizer. ******************************************* Sara Billey Assistant Professor of Applied Mathematics Massachusetts Institute of Technology Web page: http://www-math.mit.edu/~sara/ Room: 2-363c Phone: (617)-253-6544 ******************************************* From sara(at-sign)math.mit.edu Thu Oct 8 16:43:32 1998 Return-Path: Received: from turing.mit.edu (TURING.MIT.EDU [18.87.0.21]) by math.mit.edu (8.8.7/8.8.7) with ESMTP id QAA17460 for ; Thu, 8 Oct 1998 16:43:32 -0400 (EDT) Received: (from sara(at-sign)localhost) by turing.mit.edu (8.8.8+Sun/8.8.7) id QAA15177; Thu, 8 Oct 1998 16:43:30 -0400 (EDT) Date: Thu, 8 Oct 1998 16:43:30 -0400 (EDT) Message-Id: <199810082043.QAA15177(at-sign)turing.mit.edu> From: Sara Billey To: combinatorics(at-sign)math.mit.edu Subject: seminar postponed Comments: Hyperbole mail buttons accepted, v04.023. X-URL: http://www-math.mit.edu/~sara The Combinatorics Seminar for tomorrow has been postponed until Monday, November 16 at 3:30pm. This will be held jointly with the Alebra and Representation Theory Seminar run by Andras Szenes. Here is the new info: Speaker: Allen Knutson (email: aknaton(at-sign)math.mit.edu) Title: The honeycomb model and regular rigid honeycombs Date: Monday, November 16 Time: 3:30pm Place: 2-143 ******************************************* Sara Billey Assistant Professor of Applied Mathematics Massachusetts Institute of Technology Web page: http://www-math.mit.edu/~sara/ Room: 2-363c Phone: (617)-253-6544 ******************************************* From kcollins(at-sign)mail.wesleyan.edu Fri Oct 9 16:37:16 1998 Return-Path: Received: from mail.wesleyan.edu (dns.wesleyan.edu [129.133.12.10]) by math.mit.edu (8.8.7/8.8.7) with ESMTP id QAA16215; Fri, 9 Oct 1998 16:37:16 -0400 (EDT) Received: from [129.133.30.205] (kcollins1.math.wesleyan.edu [129.133.30.205]) by mail.wesleyan.edu (8.8.6/8.7.3) with SMTP id QAA16747; Fri, 9 Oct 1998 16:35:08 -0400 (EDT) X-Sender: kcollins(at-sign)mail.wesleyan.edu Message-Id: Mime-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Date: Fri, 9 Oct 1998 16:36:35 -0400 To: kcollins(at-sign)mail.wesleyan.edu From: kcollins(at-sign)wesleyan.edu (Karen L. Collins) Subject: second announcement Come to the Thirty-second one day conference on Combinatorics and Graph Theory Saturday, October 24, 1998 10 a.m. to 4:30 p.m. at Smith College Northampton MA 01063 Schedule 10:00 Lixin Gao (Smith College) Providing Video-on-Demand Services for Popular Videos 11:10 Karen Seyffarth (University of Calgary) Constructions of Large Planar Graphs with Given Diameter and Maximum Degree 12:10 Lunch 2:00 Stephen Ryan (Dartmouth College) Distinguishing Geometric Classes of Trapezoid Orders 3:10 Randy Shull (Wellesley College) A Polynomial Time Recognition Algorithm for Totally Bounded Bitolerance Digraphs The conferences are supported by an NSF grant which allows us to provide a modest transportation allowance to those attendees who are not local. We also gratefully acknowledge support from Smith College and Wesleyan University. Our Web page site has directions to Smith College, abstracts of speakers, dates of future conferences, and other information. The address is: http://math.smith.edu/~rhaas/coneweb.html Michael Albertson (Smith College), (413) 585-3865, albertson(at-sign)math.smith.edu Karen Collins (Wesleyan University), (860) 685-2169, kcollins(at-sign)wesleyan.edu Ruth Haas (Smith College), (413) 585-3872, rhaas(at-sign)math.smith.edu From sara(at-sign)math.mit.edu Wed Oct 14 10:52:26 1998 Return-Path: Received: from turing.mit.edu (TURING.MIT.EDU [18.87.0.21]) by math.mit.edu (8.8.7/8.8.7) with ESMTP id KAA19936; Wed, 14 Oct 1998 10:52:26 -0400 (EDT) Received: (from sara(at-sign)localhost) by turing.mit.edu (8.8.8+Sun/8.8.7) id KAA20897; Wed, 14 Oct 1998 10:52:24 -0400 (EDT) Date: Wed, 14 Oct 1998 10:52:24 -0400 (EDT) Message-Id: <199810141452.KAA20897(at-sign)turing.mit.edu> From: Sara Billey To: combinatorics(at-sign)math.mit.edu Subject: seminar today Comments: Hyperbole mail buttons accepted, v04.023. X-URL: http://www-math.mit.edu/~sara Combinatorics Seminar ** www-math.mit.edu/~combin Joint with Lie Groups Seminar Today at 4:15 in 2-338 Refreshments served at 3:45 Speaker: Michael Kleber Email: kleber(at-sign)math.mit.edu Title: Quadratic relations among characters There is a remarkable set of quadratic relations among the characters of representations of gl(n) corresponding to rectangular Young diagrams, which can be derived from the Littlewood-Richardson rule. Generalizing these relations cleverly to Lie algebras of types B-C-D (for Lie theorists), it appears we are really looking at characters of the associated quantum affine algebras. These relations led to the study of "rigged configurations" (for combinatorialists) and some new formulas for decomposing tensor products of rectangles. A recent result shows that the relations actually determine the quantum characters of rectangles, and there is some hope that this can be generalized to other characters. Upcoming Events: Friday October 16, 1998 * Kimmo Eriksson (kimmo(at-sign)nada.kth.se) "Handcuffs and the TU roomate game" Wednesday October 21, 1998 * Henry Crapo (Henry.Crapo(at-sign)inria.fr) "On 'lacets' and their manifolds" Friday October 23, 1998 * Stephanie van Willigenburg (steph(at-sign)math.york.ca) "A matrix interpretation for the descent algebra of type D" Wednesday October 28, 1998 * Harm Derksen (hderksen(at-sign)math.mit.edu) "Generalized quivers associated to reductive groups" Joint with Lie Groups Seminar Friday October 30, 1998 * Miklos Bona "Enumerating colored cacti" ******************************************* Sara Billey Assistant Professor of Applied Mathematics Massachusetts Institute of Technology Web page: http://www-math.mit.edu/~sara/ Room: 2-363c Phone: (617)-253-6544 ******************************************* From fpsac99(at-sign)grec.upc.es Thu Oct 15 13:58:17 1998 Return-Path: Received: from grec.ma2.upc.es (grec.upc.es [147.83.52.3]) by math.mit.edu (8.8.7/8.8.7) with SMTP id NAA25751; Thu, 15 Oct 1998 13:53:53 -0400 (EDT) Received: from localhost by grec.ma2.upc.es (4.1/SMI-4.1) id AA22728; Thu, 15 Oct 98 16:48:45 +0100 Date: Thu, 15 Oct 1998 16:48:45 +0100 (MET) From: "\"FPSAC'99 Barcelona\"" To: mailfpsac(at-sign)grec.upc.es Subject: 2nd call for papers (Latex file) Message-Id: Mime-Version: 1.0 Content-Type: TEXT/PLAIN; charset=US-ASCII \documentstyle{article} \pagestyle{empty} \textheight=240mm \textwidth=170mm \footskip 1cm \voffset -38mm \hoffset -25mm \def\vtr#1{\vrule width 0mm depth 0mm height #1mm} \def\colitem#1{\bigskip\noindent{\large\bf #1} \medskip} \begin{document} \null \vskip -7mm \hbox to \textwidth{\hrulefill} \vskip 4mm \centerline{\Large\bf 11-i\`eme Colloque international} \vskip 2mm \centerline{\Large\bf S\'eries Formelles et Combinatoire Alg\'ebrique} \vskip 7mm \centerline{\Large\bf SFCA'99} \vskip 3mm \centerline{\large\bf 7 Juin -- 11 Juin 1999} \vskip 3mm \centerline{\large\bf UPC Barcelone (Espagne)} \vskip 3.5mm \vskip 3.5mm \hbox to \textwidth{\hrulefill} \vskip 3mm \centerline{\large Premi\`ere annonce -- Appel \`a communications} \vskip 2mm \hbox to \textwidth{\hrulefill} \colitem{Th\`emes} \noindent Les th\`emes traditionnels du colloque sont la combinatoire alg\'ebrique et bijective dans leurs liens avec les math\'ematiques, l'informatique et la physique. \colitem{D\'eroulement de la conf\'erence} \noindent Le colloque comprend des conf\'erences invit\'ees de 60 minutes, des communications s\'electionn\'ees de 30 minutes, une s\'eance d'affichage de posters s\'elec\-tionn\'es, des d\'emonstrations de logiciels, et une session de probl\`emes. \colitem{Langues officielles} \noindent Les langues du colloque sont l'anglais et le fran\c cais. \colitem{Conf\'erenciers invit\'es} \noindent George Andrews (\'Etats unis), Miquel Angel Fiol (Espagne), Claire Kenyon (France), V\'\i{}ctor Neumann-Lara (Mexique), Cheryl Praeger (Australie), Arun Ram (\'Etats unis), Dominic Welsh (Anglaterre), Jean-Bernard Zuber (France). \colitem{Soumissions de communications et de posters} \noindent Les auteurs qui d\'esirent soumettre un article sont invit\'es \`a faire parvenir un r\'esum\'e d\'etaill\'e avant le {\it 8 Novembre 1998}. La soumission se fera de pr\'ef\'erence par l'envoi d'{\it un\/} fichier postscript par email \`a\break {\tt fpsac99(at-sign)grec.upc.es}. Les auteurs incapables d'envoyer un fichier postscript de leur r\'esum\'e d\'etaill\'e sont pri\'es d'envoyer {\it quatre copies} d'un r\'esum\'e d\'etaill\'e de douze pages maximum \`a Marc Noy, Comit\'e de programme de SFCA'99, Universitat Polit\`ecnica de Catalunya, Pau Gargallo 5, 08028 Barcelone, ESPAGNE. \smallskip \noindent Les articles soumis devront comprendre un r\'esum\'e dans les deux langues officielles du colloque (les traductions seront fournies sur demande). Les auteurs sont pri\'es d'indiquer s'ils soumettent leur article \`a titre de communication ou de poster. Les notifications d'acceptation ou de refus sont pr\'evues pour le 15 F\'evrier 1999. \colitem{Session de probl\`emes ouverts} \noindent Les participants qui souhaitent pr\'esenter des probl\`emes ouverts sont invit\'es \`a envoyer leurs contributions avant le d\'ebut du colloque, si possible par courrier \'electronique \`a l'adresse {\tt fpsac99(at-sign)grec.upc.es}. %\pagebreak \colitem{D\'emonstrations de logiciels} \noindent Les d\'emonstrations de logiciels li\'es aux th\`emes du colloque sont vivement encourag\'ees. Les personnes souhaitant faire une d\'emonstration de logiciel sont invit\'ees \`a envoyer une courte description de leur logiciel, pr\'ecisant les supports mat\'eriels n\'ecessaires, avant le {\it 15 Janvier 1999}, par email a {\tt fpsac99(at-sign)grec.upc.es}. \pagebreak \colitem{Comit\'e de programme} \noindent Gert Almkvist (Suede), Helene Barcelo (\'Etats unis), Fran\c cois Bergeron (Canada), Robert Cori (France; Pr\'esident), Jean-Marc F\'edou (France), Kazuhizo Koike (Japon), Conrado Mart\'\i{}nez (Espagne), Alexander Mikhalev (Russie), Marc Noy (Espagne), Peter Paule (Autriche), Renzo Pinzani (Italie), Rodica Simion (\'Etats Unis), Oriol Serra (Espagne; Pr\'esident), Dennis Stanton (\'Etats unis), Sheila Sundaram (\'Etats unis), Jean-Yves Thibon (France), Volkmar Welker (Allemagne), Nick Wormald (Australia), Jiang Zeng (France). \colitem{Financement de d\'eplacements} \noindent Un nombre limit\'e de subventions (r\'eserv\'ees en priorit\'e aux \'etudiants et aux scientifiques des pays de l'Est) sera disponible pour pouvoir participer au colloque. Les demandes de subvention devront contenir l'avis d'une personnalit\'e scientifique et inclure les renseignements suivants~: montant des frais de transport et de s\'ejour, montant des autres sources de financement. Toute demande devra parvenir en {\it double exemplaire} avant le {\it 15 Janvier 1999} \`a Josep M. Brunat, Comit\'e d'organisation de SFCA'99, Universitat Polit\`ecnica de Catalunya, Pau Gargallo 5, 08028 Barcelone, ESPAGNE. \colitem{Lieu} \noindent La conf\'erence se d\'eroulera \`a l'{\it Escola d'Enginyeria Industrial de Barcelona} dans l'{\it Universitat Polit\`ecnica de Catalunya}. La premi\`ere conf\'erence est pr\'evue pour le 7 Juin 1999 \`a 9 heures. \colitem{Renseignements} \noindent Une page WWW, contenant les information les plus r\'ecents sur la conference, a \'et\'e cr\'e\'ee,\break \verb|http://www-ma2.upc.es/~fpsac99|. Pour toute demande de renseignement sup\-pl\'e\-men\-taire, n'h\'esitez pas \`a \'ecrire \`a {\tt fpsac99(at-sign)grec.upc.es}. \colitem{Comit\'e d'organisation} \noindent Josep M. Brunat (UPC), Maylis Delest (U. de Bordeaux), Pilar Esqu\'e (UPC), Ferran Hurtado (UPC), Conrado Mart\'\i{}nez (UPC), Montserrat Maureso (UPC), Antonio Montes (UPC), Merc\`e Mora (UPC), Marc Noy (UPC; Pr\'esident) Jos\'e Luis Ruiz (UPC), Carlos Seara (UPC), Oriol Serra (UPC). \newpage \null \vskip -7mm \hbox to \textwidth{\hrulefill} \vskip 4mm \centerline{\Large\bf 11th International Conference on} \vskip 2mm \centerline{\Large\bf Formal Power Series and Algebraic Combinatorics} \vskip 7mm \centerline{\Large\bf FPSAC'99} \vskip 3mm \centerline{\large\bf June 7 -- 11, 1999} \vskip 3mm \centerline{\large\bf UPC Barcelona (Spain)} \vskip 3.5mm \vskip 3.5mm \hbox to \textwidth{\hrulefill} \vskip 3mm \centerline{\large First announcement -- Call for papers} \vskip 2mm \hbox to \textwidth{\hrulefill} \colitem{Topics} \noindent Algebraic and bijective combinatorics and their relations with other parts of ma\-the\-matics, computer science and physics. \colitem{Conference program} \noindent Invited lectures, contributed presentations, poster session, problem session and software demonstrations. \colitem{Official languages} \noindent The official languages of the conference are English and French. \colitem{Invited Speakers} \noindent George Andrews (USA), Miquel Angel Fiol (Spain), Claire Kenyon (France), V\'\i{}ctor Neumann-Lara (Mexico), Cheryl Praeger (Australia), Arun Ram (USA), Dominic Welsh (England), Jean-Bernard Zuber (France). \colitem{Call for papers and posters} \noindent Authors are invited to submit extended abstracts of at most twelve pages before {\em November 8, 1998}. Preferred way of submission is by sending {\em one} postscript file by email to {\tt fpsac99(at-sign)grec.upc.es}. If an author is not able to send a postscript version of her/his extended abstract, four copies of the extended abstract should be mailed to Marc Noy, Program committee of FPSAC'99, Universitat Polit\`ecnica de Catalunya, Pau Gargallo 5, 08028 Barcelona, SPAIN. \smallskip \noindent The submitted papers should begin with a summary written in the two official languages of the conference (translations will be provided if necessary). Authors should indicate the mode of presentation which they consider appropriate for their paper: lecture or poster session. The notifications of acceptance or rejection are scheduled for February 15, 1999. \colitem{Open problem session} \noindent Contributions to the problem session are invited in advance of the conference dates. If possible, problems should be submitted by e-mail to the address {\tt fpsac99(at-sign)grec.upc.es}. %\pagebreak \colitem{Software demonstrations} \noindent Demonstrations of software relevant to the topics of the conference are encouraged. People interested in giving a software demonstration should submit a paper as described above, including the hardware requirements, before {\it January 15, 1999}, by email to {\tt fpsac99(at-sign)grec.upc.es}. \pagebreak \colitem{Program committee} \noindent Gert Almkvist (Sweden), Helene Barcelo (USA), Fran\c cois Bergeron (Canada), Robert Cori (France; Chairman), Jean-Marc F\'edou (France), Kazuhizo Koike (Japan), Conrado Mart\'\i{}nez (Spain), Alexander Mikhalev (Russia), Marc Noy (Spain), Peter Paule (Austria), Renzo Pinzani (Italy), Rodica Simion (USA), Oriol Serra (Spain; Chairman), Dennis Stanton (USA), Sheila Sundaram (USA), Jean-Yves Thibon (France), Volkmar Welker (Germany), Nick Wormald (Australia), Jiang Zeng (France). \colitem{Participant support} \noindent Limited funds are available for partial support of participants, in particular for students and scientists from Eastern countries. Requests should contain a letter of recommendation and include the estimated transportation and living expenses as well as the amount of support available from other sources. All requests should be sent {\em in duplicate by January 15, 1999\/} to the following address: Josep M. Brunat, Organizing committee of FPSAC '99, Universitat Polit\`ecnica de Catalunya, Pau Gargallo 5, 08028 Barcelona, SPAIN. \colitem{Location} \noindent The conference will take place at the {\it Escola d'Enginyeria Industrial de Barcelona} in the {\it Universitat Polit\`ecnica de Catalunya}. The first talk is scheduled on June 7, 1999 at 9:00 a.m. \colitem{Further information} \noindent A WWW site \verb|http://www-ma2.upc.es/~fpsac99| has been set up for the conference which will contain the latest state of affairs. For any further question, just write to {\tt fpsac99(at-sign)grec.upc.es}. \colitem{Organizing committee} \noindent Josep M. Brunat (UPC), Maylis Delest (Bordeaux U.), Pilar Esqu\'e (UPC), Ferran Hurtado (UPC), Conrado Mart\'\i{}nez (UPC), Montserrat Maureso (UPC), Antonio Montes (UPC), Merc\`e Mora (UPC), Marc Noy (UPC; Chairman) Jos\'e Luis Ruiz (UPC), Carlos Seara (UPC), Oriol Serra (UPC). \end{document} From kcollins(at-sign)mail.wesleyan.edu Sun Oct 18 10:53:38 1998 Return-Path: Received: from mail.wesleyan.edu (mail.wesleyan.edu [129.133.1.51]) by math.mit.edu (8.8.7/8.8.7) with ESMTP id KAA09073; Sun, 18 Oct 1998 10:53:36 -0400 (EDT) Received: from [129.133.30.205] (kcollins1.math.wesleyan.edu [129.133.30.205]) by mail.wesleyan.edu (8.8.6/8.7.3) with SMTP id KAA03601; Sun, 18 Oct 1998 10:51:31 -0400 (EDT) X-Sender: kcollins(at-sign)mail.wesleyan.edu Message-Id: Mime-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Date: Sun, 18 Oct 1998 10:54:13 -0400 To: kcollins(at-sign)mail.wesleyan.edu From: kcollins(at-sign)wesleyan.edu (Karen L. Collins) Subject: third announcement Come to the Thirty-second one day conference on Combinatorics and Graph Theory Saturday, October 24, 1998 10 a.m. to 4:30 p.m. at Smith College Northampton MA 01063 Schedule 10:00 Lixin Gao (Smith College) Providing Video-on-Demand Services for Popular Videos 11:10 Karen Seyffarth (University of Calgary) Constructions of Large Planar Graphs with Given Diameter and Maximum Degree 12:10 Lunch 2:00 Stephen Ryan (Dartmouth College) Distinguishing Geometric Classes of Trapezoid Orders 3:10 Randy Shull (Wellesley College) A Polynomial Time Recognition Algorithm for Totally Bounded Bitolerance Digraphs The conferences are supported by an NSF grant which allows us to provide a modest transportation allowance to those attendees who are not local. We also gratefully acknowledge support from Smith College and Wesleyan University. Our Web page site has directions to Smith College, abstracts of speakers, dates of future conferences, and other information. The address is: http://math.smith.edu/~rhaas/coneweb.html Michael Albertson (Smith College), (413) 585-3865, albertson(at-sign)math.smith.edu Karen Collins (Wesleyan University), (860) 685-2169, kcollins(at-sign)wesleyan.edu Ruth Haas (Smith College), (413) 585-3872, rhaas(at-sign)math.smith.edu From piacenti(at-sign)axp.mat.uniroma2.it Mon Oct 26 15:01:12 1998 Return-Path: Received: from grec.ma2.upc.es (grec.upc.es [147.83.52.3]) by math.mit.edu (8.8.7/8.8.7) with SMTP id PAA06923; Mon, 26 Oct 1998 15:01:06 -0500 (EST) Received: from axp.mat.uniroma2.it by grec.ma2.upc.es (4.1/SMI-4.1) id AA18566; Mon, 26 Oct 98 20:56:03 +0100 Received: from localhost by axp.mat.uniroma2.it (5.65v4.0/1.1.19.2/21Oct98-0137PM) id AA10534; Mon, 26 Oct 1998 11:10:38 GMT Date: Mon, 26 Oct 1998 11:10:38 +0000 (WET) From: Giulia Maria Piacentini Cattaneo To: mailfpsac(at-sign)grec.upc.es Subject: mailing list Message-Id: Mime-Version: 1.0 Content-Type: TEXT/PLAIN; charset=US-ASCII I am interested in receiving informations in the Barcelona Conference FPSAC 99. Also, could you send me le mailing list of those attending the conference? Thank you G.M.Piacentini Cattaneo From sara(at-sign)math.mit.edu Wed Oct 28 13:39:28 1998 Return-Path: Received: from turing.mit.edu (TURING.MIT.EDU [18.87.0.21]) by math.mit.edu (8.8.7/8.8.7) with ESMTP id NAA06807; Wed, 28 Oct 1998 13:39:28 -0500 (EST) Received: (from sara(at-sign)localhost) by turing.mit.edu (8.8.8+Sun/8.8.7) id NAA10537; Wed, 28 Oct 1998 13:39:27 -0500 (EST) Date: Wed, 28 Oct 1998 13:39:27 -0500 (EST) Message-Id: <199810281839.NAA10537(at-sign)turing.mit.edu> From: Sara Billey To: combinatorics(at-sign)math.mit.edu Subject: seminar today Comments: Hyperbole mail buttons accepted, v04.023. X-URL: http://www-math.mit.edu/~sara Combinatorics Seminar ** www-math.mit.edu/~combin Joint with Lie Groups Seminar Today at 4:15 in 2-338 Refreshments served at 3:45 Speaker: Harm Derksen (MIT) Email: hderksen(at-sign)math.mit.edu Title: Generalized quivers associated to reductive groups Suppose we are given a quiver (directed graph) S, for example o--->o--->o. A representation of this quiver is triple (V,W,X) of vector spaces together with a pair (f,g) where f:V-->W and g:W-->X are linear maps. If we fix the dimensions, say (dim V,dim W, dim X)=(a,b,c), then the isomorphism classes of all representations of S with these dimensions correspond to GL(a)xGL(b)xGL(c)-orbits in the direct sum of Hom(k^a,k^b) and Hom(k^b,k^c). So very informally: "Quiver are orbits of a products of GL_n's in certain nice representations". This perspective will motivate us to give a definition of quiver representations for arbitrary reductive groups. It turns out to make sense: for orthogonal and symplectic groups our generalization has a nice interpretation, namely, they correspond to so-called orthogonal and symplectic representations of quivers with an arrow-inverting automorphism (called symmetric quivers). Among other things we will classify the symmetric quivers of finite and tame type, and their indecomposable representations. This is joint work with Jerzy Weyman at Northeastern. Upcoming Events: Friday October 30, 1998 * Miklos Bona "Enumerating colored cacti" Wednesday November 4, 1998 * Donniell Fishkind (fishkind(at-sign)brutus.mts.jhu.edu) "Fractional and affine isomorphism for graphs and posets" Friday November 6, 1998 * Tim Chow (tchow(at-sign)alum.mit.edu) "How much about sieves and zeta functions can we steal from number theory" Wednesday November 11, 1998 * Veterans' Day Friday November 13, 1998 * Peter Trapa (IAS) "Robinson-Schensted Algorithms for Lie Groups" Monday November 16, 1998 * Allen Knutson **3:30 in room 2-143** "The honeycomb model and regular ridgid honeycombs" Wednesday November 18, 1998 * Andreas Dress (dress(at-sign)chs1ce.engr.ccny.cuny.edu) "Chaucer, the Genom, and the Combinatorics of Finite Metric Spaces" Friday November 20, 1998 * Geza Toth (toth(at-sign)math.mit.edu) "New bounds on Crossing Numbers" Wednesday November 25, 1998 * Thanksgiving Friday November 27, 1998 * Thanksgiving ******************************************* Sara Billey Assistant Professor of Applied Mathematics Massachusetts Institute of Technology Web page: http://www-math.mit.edu/~sara/ Room: 2-363c Phone: (617)-253-6544 ******************************************* From selmi(at-sign)dir.univ-rouen.fr Wed Oct 28 16:46:07 1998 Return-Path: Received: from grec.ma2.upc.es (grec.upc.es [147.83.52.3]) by math.mit.edu (8.8.7/8.8.7) with SMTP id QAA14247; Wed, 28 Oct 1998 16:46:04 -0500 (EST) Received: from lir.dir.univ-rouen.fr by grec.ma2.upc.es (4.1/SMI-4.1) id AA24238; Wed, 28 Oct 98 22:52:56 +0100 Received: (from selmi(at-sign)localhost) by lir.dir.univ-rouen.fr (8.8.5/8.8.5) id PAA05119; Wed, 28 Oct 1998 15:09:09 GMT Date: Wed, 28 Oct 1998 15:09:09 GMT From: "Carla.Selmi" Message-Id: <199810281509.PAA05119(at-sign)lir.dir.univ-rouen.fr> To: mailfpsac(at-sign)grec.upc.es, piacenti(at-sign)axp.mat.uniroma2.it Subject: Re: mailing list For receiving informations in Barcelona Conference FPSAC99, please write to Professor J.M. Champarnaud From iarrobin(at-sign)neu.edu Thu Oct 29 19:54:00 1998 Return-Path: Received: from hub2.dac.neu.edu (hub2.dac.neu.edu [129.10.1.7]) by math.mit.edu (8.8.7/8.8.7) with ESMTP id TAA21357; Thu, 29 Oct 1998 19:53:59 -0500 (EST) Received: from [129.10.172.105] by neu.edu (PMDF V5.1-8 #D3123) with ESMTP id <01J3JZK1W34G9KMYAW(at-sign)neu.edu>; Thu, 29 Oct 1998 19:53:53 EST Date: Thu, 29 Oct 1998 20:58:32 -0400 From: Anthony Iarrobino Subject: Of possible interest: Klyachko talks X-Sender: nuhub.dac.neu.edu (Unverified) To: combinatorics(at-sign)math.mit.edu Cc: sara(at-sign)math.mit.edu Message-id: MIME-version: 1.0 Content-type: text/plain; charset="us-ascii" On Monday Nov. 2 at 1:30 PM, in Northeastern's Geometry-Algebra-Singularities and Combinatorics Seminar at 509 Lake Hall: Alexander A. Klyachko (Bilkent U., Turkey): "Random walks on symmetric spaces and the singular spectrum of a matrix product" (for abstract, see posting at GASC web page: www.math.neu.edu/~suciu/gasc). _____ He will also give the Brandeis-Harvard-MIT-Northeastern Colloquium on Thursday, Nov. 5, at 4:30 PM at 509 Lake Hall (tea beforehand at 4 same place): "Vector bundles and Hermitian operators" For more info, see Brandeis-Harvard-MIT-Northeastern Colloquium web page: www.math.neu/colloquium From mmf(at-sign)math.u-bordeaux.fr Fri Oct 30 02:48:27 1998 Return-Path: Received: from grec.ma2.upc.es (grec.upc.es [147.83.52.3]) by math.mit.edu (8.8.7/8.8.7) with SMTP id CAA26770; Fri, 30 Oct 1998 02:48:07 -0500 (EST) Received: from mercure.math.u-bordeaux.fr by grec.ma2.upc.es (4.1/SMI-4.1) id AA28580; Fri, 30 Oct 98 09:18:47 +0100 Received: from gromit.math.u-bordeaux.fr by mercure.math.u-bordeaux.fr; Tue, 27 Oct 1998 11:51:21 +0100 (MET) X-Url: http://www.math.u-bordeaux.fr Received: (from mmf(at-sign)localhost) by gromit.math.u-bordeaux.fr (8.8.7/8.8.7) id LAA19560; Tue, 27 Oct 1998 11:49:13 +0100 Date: Tue, 27 Oct 1998 11:49:13 +0100 Message-Id: <199810271049.LAA19560(at-sign)gromit.math.u-bordeaux.fr> From: Michel Mendes France To: piacenti(at-sign)axp.mat.uniroma2.it Cc: mailfpsac(at-sign)grec.upc.es In-Reply-To: (message from Giulia Maria Piacentini Cattaneo on Mon, 26 Oct 1998 11:10:38 +0000 (WET)) Subject: Re: mailing list References: Dear Colleague, Are you really sure you intended to send me your message asking for information about the Fpsac 99 conference in Barcelona.As far as I know I'm not in the organising committee.But I will verify. Best wishes, Michel MF From fpsac99(at-sign)grec.ma2.upc.es Fri Oct 30 06:38:50 1998 Return-Path: Received: from grec.ma2.upc.es (grec.upc.es [147.83.52.3]) by math.mit.edu (8.8.7/8.8.7) with SMTP id GAA28316; Fri, 30 Oct 1998 06:38:22 -0500 (EST) Received: by grec.ma2.upc.es (4.1/SMI-4.1) id AA29209; Fri, 30 Oct 98 12:20:48 +0100 Date: Fri, 30 Oct 98 12:20:48 +0100 From: fpsac99(at-sign)grec.ma2.upc.es ("FPSAC'99 Barcelona") Message-Id: <9810301120.AA29209(at-sign)grec.ma2.upc.es> To: mailfpsac Dear Colleagues, In the last days some confusing messages have been distributed addressed to the mailing list of the FPSAC conference. We ask you NOT to reply neither send CC to the mailing list. If you have any question about the conference please write to fpsac99(at-sign)grec.upc.es. Organizing Committee of FPSAC'99 From zaslav(at-sign)math.binghamton.edu Fri Oct 30 18:12:37 1998 Return-Path: Received: from grec.ma2.upc.es (grec.upc.es [147.83.52.3]) by math.mit.edu (8.8.7/8.8.7) with SMTP id SAA19124; Fri, 30 Oct 1998 18:12:34 -0500 (EST) Received: from math.binghamton.edu by grec.ma2.upc.es (4.1/SMI-4.1) id AA02669; Sat, 31 Oct 98 00:48:18 +0100 Received: from bywater by math.binghamton.edu (SMI-8.6/SMI-SVR4) id NAA21425; Fri, 30 Oct 1998 13:13:30 -0500 Received: by bywater (SMI-8.6/SMI-SVR4) id NAA10727; Fri, 30 Oct 1998 13:13:30 -0500 Date: Fri, 30 Oct 1998 13:13:30 -0500 From: zaslav(at-sign)math.binghamton.edu (Thomas Zaslavsky) Message-Id: <199810301813.NAA10727(at-sign)bywater> To: mmf(at-sign)math.u-bordeaux.fr Subject: Re: mailing list Cc: zaslav(at-sign)math.binghamton.edu, mailfpsac(at-sign)grec.upc.es X-Sun-Charset: US-ASCII Spam alert! I have been receiving private messages about the FPSAC 99 in Barcelona. People are using a mailing list to send these messages. Please CEASE and DESIST! Address your message to the persons you particularly want to receive them and NOT TO ANYONE ELSE. Thank you. T. Zaslavsky From ganter(at-sign)NALW01.math.tu-dresden.de Sat Oct 31 18:55:52 1998 Return-Path: Received: from grec.ma2.upc.es (grec.upc.es [147.83.52.3]) by math.mit.edu (8.8.7/8.8.7) with SMTP id SAA03678; Sat, 31 Oct 1998 18:55:46 -0500 (EST) Received: from POP3.tu-dresden.de by grec.ma2.upc.es (4.1/SMI-4.1) id AA03306; Sun, 1 Nov 98 01:42:17 +0100 Received: from rmail.urz.tu-dresden.de by rks3 with SMTP (PP); Thu, 29 Oct 1998 09:15:30 +0100 Received: from NALW01.math.tu-dresden.de by rmail with SMTP (IC-PP); Thu, 29 Oct 1998 09:16:44 +0100 Received: by NALW01.math.tu-dresden.de (4.1/SMI-4.1) id AA00252; Thu, 29 Oct 98 09:19:50 +0100 From: ganter(at-sign)NALW01.math.tu-dresden.de (Bernhard Ganter) Message-Id: <9810290819.AA00252(at-sign)NALW01.math.tu-dresden.de> Subject: STOP!! To: mailfpsac(at-sign)grec.upc.es Date: Thu, 29 Oct 1998 09:19:50 +0100 (MET) X-Mailer: ELM [version 2.4 PL22] Content-Type: text Dear colleagues, I am NOT interested in informations about FPSAC99, but I keep getting e-mails on this matter. Please cancel my name from your mailing list. Sincerely, Bernhard Ganter PS.: I whish your conference best success! From regev(at-sign)wisdom.weizmann.ac.il Sun Nov 1 08:13:05 1998 Return-Path: Received: from grec.ma2.upc.es (grec.upc.es [147.83.52.3]) by math.mit.edu (8.8.7/8.8.7) with SMTP id IAA09447; Sun, 1 Nov 1998 08:12:56 -0500 (EST) Received: from narkis.wisdom.weizmann.ac.il by grec.ma2.upc.es (4.1/SMI-4.1) id AA03499; Sun, 1 Nov 98 14:55:48 +0100 Received: from wisdom.weizmann.ac.il (wisdom.weizmann.ac.il [132.76.80.77]) by narkis.wisdom.weizmann.ac.il (8.6.5/mail.byaddr) with ESMTP id LAA00753 for ; Tue, 27 Oct 1998 11:40:06 +0200 Received: from localhost (regev(at-sign)localhost) by wisdom.weizmann.ac.il (950413.SGI.8.6.12/8.6.5) with SMTP id LAA16470 for ; Tue, 27 Oct 1998 11:40:01 +0200 X-Authentication-Warning: wisdom.weizmann.ac.il: regev owned process doing -bs Date: Tue, 27 Oct 1998 11:40:01 +0200 (IST) From: Regev Amitai To: mailfpsac(at-sign)grec.upc.es Message-Id: Mime-Version: 1.0 Content-Type: TEXT/PLAIN; charset=US-ASCII I am interested in receiving information about the Barcelona Conference FPSAC 99. Thanks, Amitai Regev From soltys(at-sign)math.toronto.edu Sun Nov 1 13:26:17 1998 Return-Path: Received: from grec.ma2.upc.es (grec.upc.es [147.83.52.3]) by math.mit.edu (8.8.7/8.8.7) with SMTP id NAA12759; Sun, 1 Nov 1998 13:26:13 -0500 (EST) Received: from yonge.cs.toronto.edu by grec.ma2.upc.es (4.1/SMI-4.1) id AA03639; Sun, 1 Nov 98 20:11:05 +0100 Received: from dvp.cs.toronto.edu ([128.100.1.15]) by yonge.cs.toronto.edu with SMTP id <86508-24393>; Sun, 1 Nov 1998 13:02:57 -0500 Received: from lunatic.dialin.utoronto.ca ([142.150.129.2]) by dvp.cs.toronto.edu with SMTP id <15567-25003>; Sun, 1 Nov 1998 13:02:49 -0500 Date: Sun, 1 Nov 1998 13:06:51 -0500 From: Michael Soltys X-Sender: soltys(at-sign)soltys.basil To: Regev Amitai Cc: mailfpsac(at-sign)grec.upc.es Subject: Re: your mail In-Reply-To: Message-Id: Mime-Version: 1.0 Content-Type: TEXT/PLAIN; charset=US-ASCII Please STOP sending me email about your conference !!!!!!!!!!!! University of Toronto / Dept. of Mathematics Michael Soltys-Kulinicz soltys(at-sign)math.toronto.edu http://www.math.toronto.edu/~soltys From bordoni(at-sign)mercurio.mat.uniroma1.it Mon Nov 2 03:57:19 1998 Return-Path: Received: from grec.ma2.upc.es (grec.upc.es [147.83.52.3]) by math.mit.edu (8.8.7/8.8.7) with SMTP id DAA23439; Mon, 2 Nov 1998 03:52:24 -0500 (EST) Received: from mat.uniroma1.it (mercurio.mat.uniroma1.it) by grec.ma2.upc.es (4.1/SMI-4.1) id AA04014; Mon, 2 Nov 98 09:51:47 +0100 Received: from localhost (bordoni(at-sign)localhost) by mat.uniroma1.it (8.6.12/8.6.12) with ESMTP id IAA19907 for ; Mon, 2 Nov 1998 08:55:10 +0100 Date: Mon, 2 Nov 1998 08:55:09 +0100 (MET) From: Manlio Bordoni To: mailfpsac(at-sign)grec.upc.es Message-Id: Mime-Version: 1.0 Content-Type: TEXT/PLAIN; charset=US-ASCII Dear colleagues, I am NOT interested in informations about FPSAC99, but I keep getting e-mails on this matter. Please cancel my name from your mailing list. Sincerely yours Manlio BORDONI Dip. Matematica Guido Castelnuovo Universita' degli Studi di Roma "La Sapienza" P.le Aldo Moro, 2 00185 ROMA - ITALIA tel. (39)0649913280 fax (39)0644701007 email - bordoni(at-sign)mat.uniroma1.it