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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)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”.