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Vanilla 1.1.10 is a product of Lussumo. More Information: Documentation, Community Support.
I have split off spin^c from spin^c structure
in the section As the homotopy fiber of smooth W3 I have added some more comments and a proposition to make more explicit why the “determinant line” map is given on the canonical $U(1)$-components by multiplication by 2.
cross-linked the definition with central product group.
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