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Created Beck module, mentioned it (once) on the tangent category page.
There was work done on the ‘derived module’ of a group homomorphism in
R. H. Crowell, The derived module of a homomorphism, Advances in Math., 5, (1971), 210 – 238.
This is related to both Beck modules and to Fox derivatives. (i discussed this in the Menagerie, and it relates to the linearisation of crossed complexes in Ronnie Brown’s work.)
Very nice! I have added a few more pointers to this from other relevant entries.
I have also added pointer to Beck 67.
Added a reference to a preprint by Markus Szymik relating Beck modules of quandles to the detection of the unknot. NB: Richard, he is at Trondheim.
Hehe, yes, Markus and I were colleagues for a while, and meet occasionally :-). He is a very nice chap! I believe is on sabbatical at the moment, in Cambridge I think.
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