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arXiv 0903.4535math.ACmath.AG
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Ext模的Castelnuovo-Mumford正则性与同调度

Castelnuovo-Mumford regularity of Ext modules and homological degree

Marc Chardin, Dao Thanh Ha, Le Tuan Hoa

摘要:

给出了域上多项式环上Ext模的Castelnuovo-Mumford正则性的界,给出了它们的初始度、Castelnuovo-Mumford阶数和两个分次模模的生成元个数.在第二个模是环的情况下,这些一般的界限被细化。其他估计,例如,这些模块的分级件的大小,给出。我们还得到了一个绑定的同调度的Castelnuovo-Mumford正则性。这肯定地回答了Vasconcelos提出的一个问题。

英文摘要:

Bounds for the Castelnuovo-Mumford regularity of Ext modules, over a polynomial ring over a field, are given in terms of the initial degrees, Castelnuovo-Mumford regularities and number of generators of the two graded modules involved. These general bounds are refined in the case the second module is the ring. Other estimates, for instance on the size of graded pieces of these modules, are given. We also derive a bound on the homological degree in terms of the Castelnuovo-Mumford regularity. This answers positively a question raised by Vasconcelos.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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