Structural properties of acyclic heaps of pieces with Kazhdan--Lusztig theory

Details Structural properties of acyclic heaps of pieces with Kazhdan--Lusztig theory Structural properties of acyclic heaps of pieces with Kazhdan--Lusztig theory

2008-10-05

arxiv.org/abs/0810.0842v1

Mathematics

Combinatorics

Ph.D. thesis, University of Colorado, 2008. Advisor: R.M. Green. 21 figures

Scientific paper

We introduce the notions of boundary vertex, linear equivalence and effective boundary vertex in the context of Viennot's heaps of pieces. We prove that in the heap of a fully commutative element in a star reducible Coxeter group, every boundary vertex is linearly equivalent to an effective boundary vertex. Using this result, we establish Property W (in the sense of math.QA/0509363) for star reducible Coxeter groups; this corrects a mistake in the latter paper.

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