Several Convex-Ear Decompositions

Details Several Convex-Ear Decompositions Several Convex-Ear Decompositions

2006-05-09

arxiv.org/abs/math/0605238v1

Mathematics

Combinatorics

30 pages, 1 figure

Scientific paper

In this paper we give convex-ear decompositions for the order complexes of several classes of posets, namely supersolvable lattices with non-zero Mobius functions and rank-selected subposets of such lattices, rank-selected geometric lattices, and rank-selected face posets of shellable complexes which do not include the top rank. These decompositions give us many new inequalities for the h-vectors of these complexes. In addition, our decomposition of rank-selected face posets of shellable complexes allows us to prove inequalities for the flag h-vector of face posets of Cohen-Macaulay complexes.

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