Free resolutions and Lefschetz properties of some Artin Gorenstein rings of codimension four

Free resolutions and Lefschetz properties of some Artin Gorenstein rings of codimension four
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余维四的一些 Artin Gorenstein 环的自由分辨率和 Lefschetz 性质

DOI:
10.1016/j.jsc.2023.102257
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发表时间:
2024
影响因子:
0.7
通讯作者:
Schenck, Hal
Schenck, Hal
中科院分区:
数学2区
文献类型:
--
作者:
Abdallah, Nancy;Schenck, Hal

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Stanley在(Stanley,1978)中构造了一个具有非单峰H-向量(1,13,12,13,1)的Artinian Gorenstein(AG)环A的例子. Migliore-Zanello在(Migliore and Zanello,2017)中表明,对于正则性r= 4,Stanley的例子对于具有非单峰H-向量的AG环具有最小可能的余维数c。AG环的弱Lefschetz性质(WLP)已经得到了很多研究,很容易证明具有非单峰H-向量的AG环不具有WLP。在余维c= 3时,证明了所有AG环都有WLP.对于c= 4,Gondim在(Gondim,2017)中表明,WLP总是对r≤ 4成立,并给出了一个族,其中WLP对任何r≥ 7都失败,建立在Ikeda的r= 5失败的例子(Ikeda,1996)上。本文研究了A的极小自由分解及其与Lefschetz性质(包括弱性质和强性质)和Jordan型(c= 4,r≤ 6)的关系.
Abstract In (Stanley, 1978), Stanley constructs an example of an Artinian Gorenstein (AG) ring A with non-unimodal H-vector (1, 13, 12, 13, 1). Migliore-Zanello show in (Migliore and Zanello, 2017) that for regularity r= 4, Stanley's example has the smallest possible codimension c for an AG ring with non-unimodal H-vector. The weak Lefschetz property (WLP) has been much studied for AG rings; it is easy to show that an AG ring with non-unimodal H-vector fails to have WLP. In codimension c= 3 it is conjectured that all AG rings have WLP. For c= 4, Gondim shows in (Gondim, 2017) that WLP always holds for r≤ 4 and gives a family where WLP fails for any r≥ 7, building on Ikeda's example (Ikeda, 1996) of failure for r= 5. In this note we study the minimal free resolution of A and relation to Lefschetz properties (both weak and strong) and Jordan type for c= 4 and r≤ 6.
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