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arXiv 0912.4590math.DG
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开流形上某些自同构群的有界性

Boundedness of certain automorphism groups of an open manifold

Tomasz Rybicki

摘要:

证明了在有限个端的开流形上,某些对支集没有限制的同胚群或非同胚群是有界的。因此,这些群是一致完美的。为了刻画开流形的自同构群的有界性,引入了几个条件。特别地,证明了可移植流形$M$的自同构群$\mathcal D(M)$的换位子长度直径由$2fragd_{\mathcal D(M)}+2$估计,其中$fragd_{\mathcal D(M)}$是$\mathcal D(M)$在分裂范数下的直径.

英文摘要:

It is shown that certain diffeomorphism or homeomorphism groups with no restriction on support of an open manifold with finite number of ends are bounded. It follows that these groups are uniformly perfect. In order to characterize the boundedness several conditions on automorphism groups of an open manifold are introduced. In particular, it is shown that the commutator length diameter of the automorphism group $\mathcal D(M)$ of a portable manifold $M$ is estimated by $2fragd_{\mathcal D(M)}+2$, where $fragd_{\mathcal D(M)}$ is the diameter of $\mathcal D(M)$ in the fragmentation norm.

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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