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arXiv 1402.3663math.COmath.ACmath.AT
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单纯复形的Buchstaber数与经典不变量

Buchstaber numbers and classical invariants of simplicial complexes

Anton Ayzenberg

摘要:

Buchstaber不变量是一个单纯复形的数值特征,由矩角复形上的环面作用引起。本文研究了Buchstaber不变量与单纯复形的经典不变量如双分次贝蒂数和色不变量之间的关系。以下两个陈述得到证明。(1)存在一个具有不同的实和普通Buchstaber不变量的单纯复形U。(2)存在两个具有相等双阶Betti数和色数,但不同Buchstaber不变量的单纯复形.为了证明第一个定理,我们定义Buchstaber数作为广义色不变量。这种方法允许猜测所需的示例。然后,任务减少到有限的枚举的可能性,这是使用GAP计算系统完成。为了证明第二个陈述,我们使用面环的泰勒分解的性质。

英文摘要:

Buchstaber invariant is a numerical characteristic of a simplicial complex, arising from torus actions on moment-angle complexes. In the paper we study the relation between Buchstaber invariants and classical invariants of simplicial complexes such as bigraded Betti numbers and chromatic invariants. The following two statements are proved. (1) There exists a simplicial complex U with different real and ordinary Buchstaber invariants. (2) There exist two simplicial complexes with equal bigraded Betti numbers and chromatic numbers, but different Buchstaber invariants. To prove the first theorem we define Buchstaber number as a generalized chromatic invariant. This approach allows to guess the required example. The task then reduces to a finite enumeration of possibilities which was done using GAP computational system. To prove the second statement we use properties of Taylor resolutions of face rings.

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