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arXiv 1202.0044math.ACmath.CO
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平衡顶点可分解的单纯复形及其h-向量

Balanced vertex decomposable simplicial complexes and their h-vectors

Jennifer Biermann, Adam Van Tuyl

摘要:

给定任意有限单纯复形Δ,我们证明了如何构造一个新的平衡的顶点可分解的单纯复形Δ x.此外,我们还证明了单纯复形Δ x的h-向量恰好是原复形Δ的f-向量,记为f(Δ).我们将f(Δ)与Δ x的Alexander对偶的分次贝蒂数联系起来,推出了这个结果.我们的构造推广了Villarreal、Cook和Nagel的“whiskering”构造。作为我们工作的一个推论,我们增加了一个新的等价陈述Björner,Frankl和Stanley的定理,分类的f-向量的单纯复形。我们还证明了库克和Nagel,Constantinescu和Varbaro关于旗复形的h-向量的猜想的一个特例。

英文摘要:

Given any finite simplicial complex Δ, we show how to construct a new simplicial complex Δ_χ that is balanced and vertex decomposable. Moreover, we show that the h-vector of the simplicial complex Δ_χ is precisely the f-vector, denoted f(Δ), of the original complex Δ. We deduce this result by relating f(Δ) with the graded Betti numbers of the Alexander dual of Δ_χ. Our construction generalizes the "whiskering" construction of Villarreal, and Cook and Nagel. As a corollary of our work, we add a new equivalent statement to a theorem of Björner, Frankl, and Stanley that classifies the f-vectors of simplicial complexes. We also prove a special case of a conjecture of Cook and Nagel, and Constantinescu and Varbaro on the h-vectors of flag complexes.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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