Regulating Hartshorne’s connectedness theorem
Regulating Hartshorne’s connectedness theorem
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调节哈特肖恩连通性定理
DOI:
10.1007/s10801-017-0744-8
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发表时间:
2017
影响因子:
0.8
通讯作者:
Varbaro, Matteo
中科院分区:
文献类型:
--
作者:
Benedetti, Bruno;Bolognese, Barbara;Varbaro, Matteo
A classical theorem by Hartshorne states that the dual graph of any arithmetically Cohen–Macaulay projective scheme is connected. We give a quantitative version: Ifis an arithmetically Gorenstein projective scheme of regularity, and if every irreducible component ofXhas regularity, we show that the dual graph ofXis-connected. The bound is sharp. We also provide a strong converse to Hartshorne’s result: every connected graph is dual to a suitable arithmetically Cohen–Macaulay projective curve of regularity3, whose components are all rational normal curves. The regularity bound is smallest possible in general. Further consequences are: (1) every graph is the Hochster–Huneke graph of a complete equidimensional local ring. (This answers a question by Sather–Wagstaff and Spiroff). (2) The regularity of a curve is not larger than the sum of the regularities of its primary components.
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DOI:
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发表时间:
2002
期刊:
影响因子:
--
作者:
M. Hochster;C. Huneke
通讯作者:
C. Huneke
DOI:
--
发表时间:
2006
期刊:
影响因子:
--
作者:
G. Lyubeznik
通讯作者:
G. Lyubeznik
DOI:
10.1090/s0002-9939-07-08222-6
发表时间:
2005-10
期刊:
--
影响因子:
--
作者:
G. Caviglia
通讯作者:
G. Caviglia
DOI:
--
发表时间:
1978
期刊:
影响因子:
--
作者:
S. Goto;Kei
通讯作者:
Kei
影响因子:
1
作者:
Katzman M
通讯作者:
Katzman M