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    • CommentRowNumber1.
    • CommentAuthorUrs
    • CommentTimeApr 12th 2016

    created an entry braid lemma with the statement and the application to the long exact sequence of a triple in (generalized) homology.

    • CommentRowNumber2.
    • CommentAuthorTodd_Trimble
    • CommentTimeApr 12th 2016

    It’s not the most palatable proposition in the world. Someone should one day break down such propositions into more digestible components. The salamander lemma was apparently introduced as a tool for simplifying such homological algebra demonstrations; would this be the case here I wonder?

    • CommentRowNumber3.
    • CommentAuthorUrs
    • CommentTimeApr 12th 2016

    Yes, I was thinking, too, that one should try to include in the page on the braid lemma a proof via the Salamander lemma.