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• CommentRowNumber1.
• CommentAuthorUrs
• CommentTimeSep 22nd 2011
• (edited Jul 17th 2013)

I have split off spin^c from spin^c structure

• CommentRowNumber2.
• CommentAuthorUrs
• CommentTimeJul 17th 2013
• (edited Jul 17th 2013)

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.