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arXiv 1801.05069math.GT
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具有非自由基本群的流形的少顶点三角剖分

Triangulations with few vertices of manifolds with non-free fundamental group

Petar Pavešić

摘要:

研究了给定流形$M$的PL-三角剖分中顶点数的下界。虽然大多数以前的估计是基于$M$的维度和连通性,我们表明,可以通过研究$M$的基本群的结构和应用技术从Lusternik Schnirelmann范畴论提取进一步的信息。特别地,我们证明了其基本群不是自由的$d$维流形($d\ge 3$)的每个PL-三角剖分至少有$3d+1$顶点。作为推论,每个允许PL-三角剖分且顶点少于$3d$的$d$ -维($\mathbb{Z}_p$ -)同调球面同胚于$S^d$。另一个重要的结果是,每个三角与小链接的$M$是组合。

英文摘要:

We study lower bounds for the number of vertices in a PL-triangulation of a given manifold $M$. While most of the previous estimates are based on the dimension and the connectivity of $M$, we show that further information can be extracted by studying the structure of the fundamental group of $M$ and applying techniques from the Lusternik-Schnirelmann category theory. In particular, we prove that every PL-triangulation of a $d$-dimensional manifold ($d\ge 3$) whose fundamental group is not free has at least $3d+1$ vertices. As a corollary, every $d$-dimensional ($\mathbb{Z}_p$-)homology sphere that admits a PL-triangulation with less than $3d$ vertices is homeomorphic to $S^d$. Another important consequence is that every triangulation with small links of $M$ is combinatorial.

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