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• CommentRowNumber1.
• CommentAuthorUrs
• CommentTimeDec 11th 2015
• (edited Dec 11th 2015)

Way back, in the entry, equivariant cohomology, Mike (I believe) wrote:

[in naive equivariant cohomology] one sees torsion popping up in odd places where one wouldn’t expect it.

and then

$RO(G)$-graded Bredon cohomology has lots of formal advantages over the integer-graded theory. For instance, the torsion that popped up in odd places before can now be seen as arising by “shifting” of something in the cohomology of a point in an “off-integer dimension,” which was invisible to the integer-graded theory.

Which results is this alluding to?

This sounds just like the kind of effect that I was after here. So is this just a special case of something more general and well known? What would be a reference?

• CommentRowNumber2.
• CommentAuthorDavid_Corfield
• CommentTimeDec 11th 2015

That came from Mike’s blog post from discussions with Megan. Page 3 of her thesis speaks of “cohomology groups in “off-integer” dimensions”.