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arXiv 2006.09435math.AT
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整体Mackey函子的分裂与等变Euler类的正则性

Splittings of global Mackey functors and regularity of equivariant Euler classes

Stefan Schwede

摘要:

我们在正交群、酉群和辛群上建立了整体Mackey函子值的自然分裂。特别地,相邻维数的正交群、酉群和辛群之间的限制同态是自然分裂满同态。对分裂的兴趣来自等变稳定同伦理论。每个全局谱的等变稳定同伦群形成一个全局Mackey函子,因此分裂意味着某些长正合同伦群序列分裂成短正合序列。对于实的和复的整体Thom谱$\mathbf{MO}$和$\mathbf{MU}$,分裂意味着与$O(n)$和$U(n)$的重言式表示相关的各种欧拉类的正则性。

英文摘要:

We establish natural splittings for the values of global Mackey functors at orthogonal, unitary and symplectic groups. In particular, the restriction homomorphisms between the orthogonal, unitary and symplectic groups of adjacent dimensions are naturally split epimorphisms. The interest in the splitting comes from equivariant stable homotopy theory. The equivariant stable homotopy groups of every global spectrum form a global Mackey functor, so the splittings imply that certain long exact homotopy group sequences separate into short exact sequences. For the real and complex global Thom spectra $\mathbf{MO}$ and $\mathbf{MU}$, the splittings imply the regularity of various Euler classes related to the tautological representations of $O(n)$ and $U(n)$.

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