Degree bounds for local cohomology
Degree bounds for local cohomology
复制标题
局部上同调的度界
DOI:
10.1112/plms.12364
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发表时间:
2020
影响因子:
1.8
通讯作者:
Ulrich, Bernd
中科院分区:
文献类型:
--
作者:
Kustin, Andrew R.;Polini, Claudia;Ulrich, Bernd
It has long been known how to read information about the socle degrees of the local cohomologyof a graded module over a polynomial ringfrom the twists in position, in a resolution ofby free‐modules. It has also long been known how to use local cohomology to read valuable information from complexes which approximate resolutions in the sense that they have positive homology of small Krull dimension. The present paper reads information about the maximal generator degree (rather than the socle degree) offrom the twists in position(rather than position) in an approximate resolution of.We apply the local cohomology results to draw conclusions about the maximal generator degree of the second symbolic power of the prime ideal defining a monomial curve and the second symbolic power of the ideal defining a finite set of points in projective space. There is also an application to hyperplane sections of subschemes of projective space and to partial Castelnuovo–Mumford regularity. Perhaps, the most important application is to the study of blow‐up algebras and their defining equations. The techniques of the present paper are the main tool used in Kustin, Polini and Ulrich [Algebra Number Theory11 (2017) 1489–1525] to bound the degrees of these equations and thus to identify them in some cases.
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DOI:
--
发表时间:
1938
期刊:
影响因子:
--
作者:
T. G. Room
通讯作者:
T. G. Room
DOI:
--
发表时间:
1992
期刊:
影响因子:
--
作者:
A. Kustin;B. Ulrich
通讯作者:
B. Ulrich
DOI:
--
发表时间:
1998
期刊:
影响因子:
--
作者:
C. Polini;B. Ulrich
通讯作者:
B. Ulrich
DOI:
--
发表时间:
2015
期刊:
影响因子:
--
作者:
A. Kustin;C. Polini;B. Ulrich
通讯作者:
B. Ulrich
DOI:
--
发表时间:
2002
期刊:
影响因子:
--
作者:
Hsin
通讯作者:
Hsin