The Auslander-Reiten translate on monomial quotient rings

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Brun, Morten
Floystad, Gunnar
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For a multidegree t in N^n, E.Miller has defined a category of positively t-determined modules over the polynomial ring S in n variables. We consider the Auslander-Reiten translate, Na_t, on the (derived) category of such modules. A monomial ideal I is positively t-determined if every generator x^a has a \leq t. We compute the multigraded cohomology- and betti spaces of Na_t^k(S/I) for every iterate k, and also the S-module structure of these cohomology modules. This comprehensively generalizes results of Hochster and Gr\"abe on local cohomology of Stanley-Reisner rings.
Comment: 35 pages, minor changes and corrections
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Mathematics - Commutative Algebra, Mathematics - Combinatorics, 13D99, 13F99
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