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connection between non-orientable manifolds and torsion in 1D (co) homology

mar 6 11 at 17:16 rhl 13●3

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rank one pertubations of the identity, and a matrix equation [closed]

oct 31 10 at 16:21 Andrey Rekalo 13.9k●1●34●68

 
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Spaces which have the same homology groups, the same cohomology groups, but have different cohomology rings?

mar 2 11 at 18:00 damiano 3,887●8●17