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arXiv math/0505334math.CO
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二重Cohen-Macaulay复形的刚性与下界定理

Rigidity and the Lower Bound Theorem for Doubly Cohen-Macaulay Complexes

Eran Nevo

摘要:

证明了对于$d\geq 3$,任何$(d-1)$维双Cohen Macaulay(简称2-CM)复形的1-骨架是一般的$d$ -刚性.这意味着以下两个推论(分别由Kalai和Lee):巴内特的单纯多面体的边界复形的下界不等式对每个2-CM复形(维数为$\geq 2$)成立。此外,2-CM复合物的$g$ -载体(维度为$\geq 3$)的起始部分$(g_0,g_1,g_2)$是$M$ -序列. Björner和Swartz证实2-CM复合物的整个$g$载体是一个$M$序列。

英文摘要:

We prove that for $d\geq 3$, the 1-skeleton of any $(d-1)$-dimensional doubly Cohen Macaulay (abbreviated 2-CM) complex is generically $d$-rigid. This implies the following two corollaries (by Kalai and Lee respectively): Barnette's lower bound inequalities for boundary complexes of simplicial polytopes hold for every 2-CM complex (of dimension $\geq 2$). Moreover, the initial part $(g_0,g_1,g_2)$ of the $g$-vector of a 2-CM complex (of dimension $\geq 3$) is an $M$-sequence. It was conjectured by Björner and Swartz that the entire $g$-vector of a 2-CM complex is an $M$-sequence.

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