Quadratic Gorenstein algebras with many surprising properties
Quadratic Gorenstein algebras with many surprising properties
复制标题
具有许多令人惊讶的性质的二次 Gorenstein 代数
DOI:
10.1007/s00013-020-01492-x
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发表时间:
2020
影响因子:
0.6
通讯作者:
Seceleanu, Alexandra
中科院分区:
文献类型:
--
作者:
McCullough, Jason;Seceleanu, Alexandra
Letkbe a field of characteristic 0. Using the method of idealization, we show that there is a non-Koszul, quadratic, Artinian, Gorenstein, standard gradedk-algebra of regularity 3 and codimension 8, answering a question of Mastroeni, Schenck, and Stillman. We also show that this example is minimal in the sense that no other idealization that is non-Koszul, quadratic, Artinian, Gorenstein algebra, with regularity 3 has smaller codimension. We also construct an infinite family of graded, quadratic, Artinian, Gorenstein algebras, indexed by an integer, with the following properties: (1) there are minimal first syzygies of the defining ideal in degree, (2) for,is not Koszul, (3) for, the Hilbert function ofis not unimodal, and thus (4) for,does not satisfy the weak or strong Lefschetz properties. In particular, the subadditivity property fails for quadratic Gorenstein ideals. Finally, we show that the idealization of a construction of Roos yields non-Koszul quadratic Gorenstein algebras such that the residue fieldkhas a linear resolution for preciselysteps for any integer. Thus there is no finite test for the Koszul property even for quadratic Gorenstein algebras.
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DOI:
--
发表时间:
2013
期刊:
影响因子:
--
作者:
A. Conca
通讯作者:
A. Conca
影响因子:
1.8
作者:
A. Conca;M. Rossi;G. Valla
通讯作者:
G. Valla
DOI:
--
发表时间:
2013
期刊:
影响因子:
--
作者:
J. Herzog;H. Srinivasan
通讯作者:
H. Srinivasan
影响因子:
0.9
作者:
McCullough, Jason
通讯作者:
McCullough, Jason
DOI:
10.4310/acta.2018.v221.n1.a4
发表时间:
2017-06
期刊:
arXiv: Commutative Algebra
影响因子:
--
作者:
S. Iyengar;M. Walker
通讯作者:
S. Iyengar;M. Walker