Smallest Graded Betti Numbers
Smallest Graded Betti Numbers
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DOI:
10.1006/jabr.2001.8878
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发表时间:
2001
影响因子:
0.9
通讯作者:
Benjamin P. Richert
中科院分区:
文献类型:
--
作者:
Benjamin P. Richert
It is known that given a Hilbert function H, there need not exist a module which has uniquely the smallest graded Betti numbers among all modules attaining H. In this paper we extend the previous example of this behavior to an infinite family and demonstrate with a second infinite family that even when the given Hilbert function is that of a complete intersection, a module with uniquely smallest graded Betti numbers need not exist. Finally we prove a conjecture of Geramita, Harima, and Shin concerning the non-existence of uniquely smallest graded Betti numbers among all Gorenstein rings attaining a given Hilbert function.