|Aug10-09, 12:52 PM||#1|
characteristic classes of finite group representations
I know zero about the characteristic classes of finite group representations and would appreciate a reference.
specifically, if I have a faithful representations of a finite group,G, in O(n) what can I say about the induced map on cohomology,
P*:H*(BO(n))-> H*(BG) ?
I am mostly interested in Z or Z/2 coefficients so this would be Pontryagin classes and Stiefel-Whitney classes.
For instance what are the induced maps of these two representations of Z/2?
-1 reflection of the real line
0 -1 180 degree rotation of R^2.
Can you show me an unoriented representation of the dihedral group of order 8 so that the induced map on Z/2 cohomology is not surjective?
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