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arXiv 0710.2302math.ATmath.GT
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等变上同调的自由性与紧化表示的突变体

Freeness of equivariant cohomology and mutants of compactified representations

Matthias Franz, Volker Puppe

摘要:

我们调查推广的张-Skjelbred引理的积分系数。此外,我们构造了具有秩> 2环面作用的流形的例子,其等变上同调是挠自由的,但不是自由的。这回答了Allday的一个问题。我们构造的“突变体”是从紧化表示中获得的,并以一种至关重要的方式涉及Hopf丛。

英文摘要:

We survey generalisations of the Chang-Skjelbred Lemma for integral coefficients. Moreover, we construct examples of manifolds with actions of tori of rank > 2 whose equivariant cohomology is torsion-free, but not free. This answers a question of Allday's. The "mutants" we construct are obtained from compactified representations and involve Hopf bundles in a crucial way.

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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