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arXiv 0802.2772math.ACmath.CO
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单项商环上的Auslander-Reiten变换

The Auslander-Reiten translate on monomial quotient rings

Morten Brun, Gunnar Floystad

摘要:

对于N^n中的多次t,E.Miller定义了n元多项式环S上的一类t-正定模.我们考虑Auslander-Reiten平移,Na_t,在这类模的(导)范畴上.一个单项理想I是正t-确定的,如果每个生成元x^a都有一个\leq t。对任意的上同调模,我们计算了Na_t^k(S/I)的多重分次上同调空间和Betti空间,以及这些上同调模的S-模结构.这是对Hochster和Gräbe关于Stanley-Reisner环局部上同调的结果的全面推广。

英文摘要:

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 Gräbe on local cohomology of Stanley-Reisner rings.

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