Date:           Fri, 4 Sep 1998 13:37:41 -0400 (EDT)
From:           Sara Billey <sara(at-sign)math.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"

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

Date:           Tue, 8 Sep 1998 14:18:32 +0200 (MET DST)
From:           "\"FPSAC'99 Barcelona\"" <fpsac99(at-sign)grec.upc.es>
To:             mailfpsac(at-sign)grec.upc.es
Subject:        Call for papers (Latex file)

  This message is in MIME format.  The first part should be readable text,
  while the remaining parts are likely unreadable without MIME-aware tools.
  Send mail to mime(at-sign)docserver.cac.washington.edu for more info.

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--1434849887-1500773637-905257112=:25364--

Date:           Wed, 09 Sep 1998 11:56:56 +0200
From:           FPSAC99 <fpsac99(at-sign)grec.upc.es>
To:             mailfpsac(at-sign)grec.upc.es
Subject:        Call for papers (Latex file)

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}

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\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}

Date:           Wed, 9 Sep 1998 10:18:33 -0400 (EDT)
From:           Sara Billey <sara(at-sign)math.mit.edu>
To:             combinatorics(at-sign)math.mit.edu
Subject:        seminar today

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
*******************************************

Date:           Fri, 11 Sep 1998 12:16:35 -0400 (EDT)
From:           Sara Billey <sara(at-sign)math.mit.edu>
To:             combinatorics(at-sign)math.mit.edu
Subject:        seminar today

    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
*******************************************

Date:           Fri, 11 Sep 1998 18:04:43 -0400 (EDT)
From:           Sara Billey <sara(at-sign)math.mit.edu>
To:             combinatorics(at-sign)math.mit.edu
Subject:        seminar overlap

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
*******************************************

Date:           Wed, 16 Sep 1998 09:47:29 -0400 (EDT)
From:           Sara Billey <sara(at-sign)math.mit.edu>
To:             combinatorics(at-sign)math.mit.edu
Subject:        seminar today

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
*******************************************

Date:           Fri, 18 Sep 1998 11:57:06 -0400 (EDT)
From:           Sara Billey <sara(at-sign)math.mit.edu>
To:             combinatorics(at-sign)math.mit.edu
Subject:        seminar today

    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
*******************************************

Date:           Wed, 23 Sep 1998 10:24:59 -0400 (EDT)
From:           Sara Billey <sara(at-sign)math.mit.edu>
To:             combinatorics(at-sign)math.mit.edu
Subject:        seminar today

    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
*******************************************

Date:           Wed, 23 Sep 1998 13:33:52 -0400 (EDT)
From:           Richard Stanley <rstan(at-sign)math.mit.edu>
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

Date:           Thu, 24 Sep 1998 14:47:33 -0400
From:           "a. Iarrobino" <iarrobin(at-sign)neu.edu>
Subject:        Of possible interest
To:             combinatorics(at-sign)math.mit.edu

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)

Date:           Wed, 30 Sep 1998 11:51:44 -0400 (EDT)
From:           Sara Billey <sara(at-sign)math.mit.edu>
To:             combinatorics(at-sign)math.mit.edu
Subject:        NO seminar today

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
Date:           Wed, 30 Sep 1998 12:53:32 -0500 (EST)
Subject:        of possible interest
To:             combinatorics(at-sign)math.mit.edu

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]

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

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 <franzblau(at-sign)postbox.csi.cuny.edu>
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 <jwk2(at-sign)is7.nyu.edu> or
Louis V. Quintas <quintas(at-sign)pace.edu>

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
===============================================================

Date:           Fri, 2 Oct 1998 11:31:05 -0400 (EDT)
From:           Sara Billey <sara(at-sign)math.mit.edu>
To:             combinatorics(at-sign)math.mit.edu
Subject:        seminar today

    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
*******************************************

Date:           Wed, 7 Oct 1998 13:41:05 -0400 (EDT)
From:           Sara Billey <sara(at-sign)math.mit.edu>
To:             combinatorics(at-sign)math.mit.edu
Subject:        seminar today

    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
*******************************************

Date:           Thu, 8 Oct 1998 16:43:30 -0400 (EDT)
From:           Sara Billey <sara(at-sign)math.mit.edu>
To:             combinatorics(at-sign)math.mit.edu
Subject:        seminar postponed 

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
*******************************************

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

Date:           Wed, 14 Oct 1998 10:52:24 -0400 (EDT)
From:           Sara Billey <sara(at-sign)math.mit.edu>
To:             combinatorics(at-sign)math.mit.edu
Subject:        seminar today

    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
*******************************************

Date:           Thu, 15 Oct 1998 16:48:45 +0100 (MET)
From:           "\"FPSAC'99 Barcelona\"" <fpsac99(at-sign)grec.upc.es>
To:             mailfpsac(at-sign)grec.upc.es
Subject:        2nd call for papers (Latex file)

\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}

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

Date:           Mon, 26 Oct 1998 11:10:38 +0000 (WET)
From:           Giulia Maria Piacentini Cattaneo <piacenti(at-sign)axp.mat.uniroma2.it>
To:             mailfpsac(at-sign)grec.upc.es
Subject:        mailing list

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

Date:           Wed, 28 Oct 1998 13:39:27 -0500 (EST)
From:           Sara Billey <sara(at-sign)math.mit.edu>
To:             combinatorics(at-sign)math.mit.edu
Subject:        seminar today

    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
*******************************************

Date:           Wed, 28 Oct 1998 15:09:09 GMT
From:           "Carla.Selmi" <selmi(at-sign)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 

Date:           Thu, 29 Oct 1998 20:58:32 -0400
From:           Anthony Iarrobino <iarrobin(at-sign)neu.edu>
Subject:        Of possible interest: Klyachko talks
To:             combinatorics(at-sign)math.mit.edu

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

Date:           Tue, 27 Oct 1998 11:49:13 +0100
From:           Michel Mendes France <mmf(at-sign)math.u-bordeaux.fr>
To:             piacenti(at-sign)axp.mat.uniroma2.it
Subject:        Re: mailing list

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

Date:           Fri, 30 Oct 98 12:20:48 +0100
From:           fpsac99(at-sign)grec.ma2.upc.es ("FPSAC'99 Barcelona")
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

Date:           Fri, 30 Oct 1998 13:13:30 -0500
From:           zaslav(at-sign)math.binghamton.edu (Thomas Zaslavsky)
To:             mmf(at-sign)math.u-bordeaux.fr
Subject:        Re: mailing list

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 (Bernhard Ganter)
Subject:        STOP!!
To:             mailfpsac(at-sign)grec.upc.es
Date:           Thu, 29 Oct 1998 09:19:50 +0100 (MET)

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!

Date:           Tue, 27 Oct 1998 11:40:01 +0200 (IST)
From:           Regev Amitai <regev(at-sign)wisdom.weizmann.ac.il>
To:             mailfpsac(at-sign)grec.upc.es

I am interested in receiving information about the Barcelona Conference
FPSAC 99.
Thanks,
Amitai Regev

Date:           Sun, 1 Nov 1998 13:06:51 -0500
From:           Michael Soltys <soltys(at-sign)math.toronto.edu>
To:             Regev Amitai <regev(at-sign)wisdom.weizmann.ac.il>
Subject:        Re: your mail

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

Date:           Mon, 2 Nov 1998 08:55:09 +0100 (MET)
From:           Manlio Bordoni <bordoni(at-sign)mercurio.mat.uniroma1.it>
To:             mailfpsac(at-sign)grec.upc.es

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