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    • CommentRowNumber1.
    • CommentAuthorTim_Porter
    • CommentTimeApr 17th 2013

    Looking at the list there at twisted cohomology is the word ‘getsted’???? does anyone remember what the word was meant to be?!

    • CommentRowNumber2.
    • CommentAuthorUrs
    • CommentTimeApr 17th 2013

    I believe Jim Stasheff wrote that. Maybe he meant “guessed”? I don’t know. Maybe he sees this here.

    • CommentRowNumber3.
    • CommentAuthorDmitri Pavlov
    • CommentTimeJul 18th 2022


    Homology with local coefficients was introduced in

    An independent account appeared in

    • Norman E. Steenrod, Homology with local coefficients, Annals of Mathematics (Second Series) 44:4 (1943).

    The paper

    • Samuel Gitler, Cohomology operations with local coefficients, American Journal of Mathematics 85:2 (1963), 156–188. doi

    shows that twisted Eilenberg–MacLane spaces classify cohomology with local coefficients.

    diff, v80, current

    • CommentRowNumber4.
    • CommentAuthorUrs
    • CommentTimeJul 19th 2022
    • (edited Jul 19th 2022)

    We also have an entry twisted ordinary cohomology. This already listed Steenrod’s and Gitler’s articles. I am copying Reidemeister’s article to there, and am adding the cross-link between the two entries more prominently.

    • CommentRowNumber5.
    • CommentAuthorUrs
    • CommentTimeJul 19th 2022
    • (edited Jul 19th 2022)

    By the way, for the classification of twisted ordinary cohomology by fibrations of EM-spaces I am usually pointing to these three articles (from twisted ordinary cohomologyReferences), which make it rather transparent: