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Ultrafilter! Waffle! - FLMPotD
March 26th, 2011
02:17 pm

FLMPotD
Find a commutative ring R, a multiplicative subset S \subset R, and finitely generated R-modules M and N such that the natural map S^{-1}Hom(M,N) \to Hom(S^{-1}M,S^{-1}N) is not an isomorphism.

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