MIT Combinatorics Seminar

A Loday's Realization For The Cyclohedron

Carsten Lange (University of Washington, Seattle)

Friday, Arpil 14, 2006   4:30 PM;   Building 2 Room 105; 


We describe different realizations with integer coordinates for the associahedron (i.e., the Stasheff polytope) and for the cyclohedron (i.e., the Bott-Taubes polytope), and compare them to the permutahedra of type A and B, respectively.

The coordinates are obtained by an algorithm which uses an oriented Coxeter graph of type A or B respectively as the only input and which specialises to a procedure presented by J.-L. Loday for a certain orientation of the Coxeter graph of A.

This is joint work with Christophe Hohlweg.