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arXiv 0709.4018math.GTmath.GN
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具有二维基本群的空间的Lusternik-Schnirelmann范畴

On the Lusternik-Schnirelmann category of spaces with 2-dimensional fundamental group

A. Dranishnikov

摘要:

下面的不等式\cat X \le \cat Y+ \lceil \frac{hd(X)-r}{r+1} \rceil对每个在$ANE$空间$f:X\to Y$之间的局部平凡纤维化成立,其中$hd(X)$是$X$的同伦维数。我们应用这个不等式证明了对于每一个具有$cd(π_1(X))\le 2$的复$X$,\cat X \le \lceil \frac{\dim X-1}{2} \rceil +cd(π_1(X)).

英文摘要:

The following inequality \cat X\le \cat Y+\lceil\frac{hd(X)-r}{r+1}\rceil holds for every locally trivial fibration between $ANE$ spaces $f:X\to Y$ which admits a section and has the $r$-connected fiber where $hd(X)$ is the homotopical dimension of $X$. We apply this inequality to prove that \cat X\le \lceil\frac{\dim X-1}{2}\rceil+cd(π_1(X)) for every complex $X$ with $cd(π_1(X))\le 2$.

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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