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created Mod
Question: How is this different from ?
Ab is the fibre over the ring of integers.
I added that remark to the entry now.
Oh, by the way, a morphism of pairs of rings and modules (R,M) -> (S,N) the way you described is called a dihomomorphism (dihomomorphisme) on the first page of EGA I. Also, what you added made it easier to understand. Thanks!
@Urs I think you will find that the observation of Quillen is actually referenced in Quillen's paper to Beck's thesis. It should be if it is not, as Jon Beck looked at the Abelianisation in that case. (Come to think of it it may be even earlier in Grothendieck Catégories cofibrées additives? I would have to check dates and content.)
added to Mod in the section RMod is an abelian category more of the elementary details of the various statements there.
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