Shellability and the strong gcd-condition

Details Shellability and the strong gcd-condition Shellability and the strong gcd-condition

2008-08-13

arxiv.org/abs/0808.1813v1

Electron. J. Combin. 16 (2009), no. 2, Special volume in honor of Anders Bjorner, Research Paper 1, 7 pp

Mathematics

Combinatorics

6 pages

Scientific paper

Shellability is a well-known combinatorial criterion for verifying that a simplicial complex is Cohen-Macaulay. Another notion familiar to commutative algebraists, but which has not received as much attention from combinatorialists as the Cohen-Macaulay property, is the notion of a Golod ring. Recently, a criterion on simplicial complexes reminiscent of shellability, called the strong gcd-condition, was shown to imply Golodness of the associated Stanley-Reisner ring. The two algebraic notions were tied together by Herzog, Reiner and Welker who showed that if the Alexander dual of a complex is sequentially Cohen-Macaulay then the complex itself is Golod. In this paper, we present a combinatorial companion of this result, namely that if the Alexander dual of a complex is (non-pure) shellable then the complex itself satisfies the strong gcd-condition. Moreover, we show that all implications just mentioned are strict in general but that they are equivalences for flag complexes.

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