关于闭流形与有限cw -复形的同伦

Yang Su, Xiaolei Wu
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引用次数: 0

摘要

通过将闭流形和有限cw -复形的同伦群与它们的基群的上同调联系起来,研究了它们的有限生成。我们的主要定理如下:当$X$是一个维数为$n$的有限复形,$\pi_1(X)$是一个维数为$\geq n-1$的Poincare对偶群时,除非$X$同伦等价于Eilenberg-Maclane空间$K(\pi_1(X),1)$,否则$\pi_i(X)$对于某些$i$不是有限生成的;当$M$是一个$n$维的封闭流形,而$\pi_1(M)$实际上是一个$\ge n-1$维的庞加莱对偶群,那么对于某些$i\leq [n/2]$, $\pi_i(M)$不是有限生成的,除非$M$本身是一个非球面流形。这些将M. Damian定理从多环群推广到任何虚庞加莱对偶群。当$\pi_1(X)$不是一个虚庞加莱对偶群时,我们也得到了类似的结果。作为我们的结果的副产品,我们表明,如果群$G$是F型的,并且对于任何$i$都有限地生成$H^i(G, \mathbb{Z} G)$,则$G$是庞加莱对偶群。这部分地恢复了法雷尔的一个定理。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
On the homotopy of closed manifolds and finite CW-complexes
We study the finite generation of homotopy groups of closed manifolds and finite CW-complexes by relating it to the cohomology of their fundamental groups. Our main theorems are as follows: when $X$ is a finite CW-complex of dimension $n$ and $\pi_1(X)$ is virtually a Poincare duality group of dimension $\geq n-1$, then $\pi_i(X)$ is not finitely generated for some $i$ unless $X$ is homotopy equivalent to the Eilenberg-Maclane space $K(\pi_1(X),1)$; when $M$ is an $n$-dimensional closed manifold and $\pi_1(M)$ is virtually a Poincare duality group of dimension $\ge n-1$, then for some $i\leq [n/2]$, $\pi_i(M)$ is not finitely generated, unless $M$ itself is an aspherical manifold. These generalize theorems of M. Damian from polycyclic groups to any virtually Poincare duality groups. When $\pi_1(X)$ is not a virtually Poincare duality group, we also obtained similar results. As a by-product of our results, we show that if a group $G$ is of type F and $H^i(G, \mathbb{Z} G)$ is finitely generated for any $i$, then $G$ is a Poincare duality group. This recovers partially a theorem of Farrell.
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