Quasi-cyclic modules and coregular sequences
Quasi-cyclic modules and coregular sequences
复制标题
准循环模和共正则序列
DOI:
10.1007/s00209-020-02676-5
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发表时间:
2021
影响因子:
0.8
通讯作者:
Polini, Claudia
中科院分区:
文献类型:
--
作者:
Hartshorne, Robin;Polini, Claudia
We develop the theory of coregular sequences and codepth for modules that need not be finitely generated or artinian over a Noetherian ring. We use this theory to give a new version of a theorem of Hellus characterizing set-theoretic complete intersections in terms of local cohomology modules. We also define quasi-cyclic modules as increasing unions of cyclic modules, and show that modules of codepth at least two are quasi-cyclic. We then focus our attention on curves inand give a number of necessary conditions for a curve to be a set-theoretic complete intersection. Thus an example of a curve for which any of these necessary conditions does not hold would provide a negative answer to the still open problem, whether every connected curve inis a set-theoretic complete intersection.
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