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arXiv 1406.2226math.GTmath.DG
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2连通7流形的分类

The classification of 2-connected 7-manifolds

Diarmuid Crowley, Johannes Nordström

摘要:

给出了闭光滑自旋2-连通7-流形M的一个分类定理。这建立在第一作者论文中的几乎平滑分类的基础上。主要的附加成分是Eells-Kuiper不变量对任意闭自旋7-流形的推广,而不管M的第四积分上同调中的自旋示性类p_M是否为挠。此外,我们还确定了2-连通M的惯性群--等价于底层拓扑流形上定向光滑结构的个数--用p_M和挠链形式表示.

英文摘要:

We present a classification theorem for closed smooth spin 2-connected 7-manifolds M. This builds on the almost-smooth classification from the first author's thesis. The main additional ingredient is an extension of the Eells-Kuiper invariant for any closed spin 7-manifold, regardless of whether the spin characteristic class p_M in the fourth integral cohomology of M is torsion. In addition we determine the inertia group of 2-connected M - equivalently the number of oriented smooth structures on the underlying topological manifold - in terms of p_M and the torsion linking form.

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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