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arXiv 1709.07930math.CO
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凸复形的重心重分是可折叠的

Barycentric subdivisions of convex complexes are collapsible

Karim Adiprasito, Bruno Benedetti

摘要:

PL拓扑中的一个经典问题是,d-单形的每个线性细分是否都是单纯可塌缩的。已知对于d<4,答案是肯定的。我们解决了问题的一个细分,通过证明,任何线性细分的任何多面体是简单可塌缩后,最多一个重心重分。进一步证明了$\mathbb{R}^d$中任意星形多面体的任意线性剖分至多经过d-2次导出剖分后都是单纯可塌缩的。这对古德里克的一个老问题提出了进展。

英文摘要:

A classical question in PL topology, asked among others by Hudson, Lickorish, and Kirby, is whether every linear subdivision of the d-simplex is simplicially collapsible. The answer is known to be positive for d<4. We solve the problem up to one subdivision, by proving that any linear subdivision of any polytope is simplicially collapsible after at most one barycentric subdivision. Furthermore, we prove that any linear subdivision of any star-shaped polyhedron in $\mathbb{R}^d$ is simplicially collapsible after d-2 derived subdivisions at most. This presents progress on an old question by Goodrick.

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