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Powers of the maximal ideal and vanishing of (co)homology

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arxiv 1901.04108 v1 pith:HVFYHDVJ submitted 2019-01-14 math.AC

classification math.AC
keywords idealmaximalcharacterizationscommutativeconditionconjecturegiveshomology
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We prove that each positive power of the maximal ideal of a commutative Noetherian local ring is Tor-rigid, and strongly-rigid. This gives new characterizations of regularity and, in particular, shows that such ideals satisfy the torsion condition of a long-standing conjecture of Huneke and Wiegand.

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  1. On an example concerning the second rigidity theorem

    math.AC 2019-08 accept novelty 7.0 of 10

    Over a hypersurface ring, if M has finite projective dimension and N is locally free at primes of height at most one, then reflexivity of M tensor N implies both M and N are reflexive.

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