Universal lex ideal approximations of extended Hilbert functions and Hamilton numbers
Universal lex ideal approximations of extended Hilbert functions and Hamilton numbers
复制标题
扩展希尔伯特函数和汉密尔顿数的通用 lex 理想近似
DOI:
10.1016/j.jalgebra.2020.06.009
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发表时间:
2020
影响因子:
0.9
通讯作者:
Hochster, Melvin
中科院分区:
文献类型:
--
作者:
Ananyan, Tigran;Hochster, Melvin
Let R (h) denote the polynomial ring in variables x 1,…, x h over a specified field K. We consider all of these rings simultaneously, and in each use lexicographic (lex) monomial order with x 1>⋯> x h. Given a fixed homogeneous ideal I in R (h), for each d there is unique lex ideal generated in degree at most d whose Hilbert function agrees with the Hilbert function of I up to degree d. When we consider I R (N) for N≥ h, the set B d (I, N) of minimal generators for this lex ideal in degree at most d may change, but B d (I, N) is constant for all N≫ 0. We let B d (I) denote the set of generators one obtains for all N≫ 0, and we let b d= b d (I) be its cardinality. The sequences b 1,…, b d,… obtained in this way may grow very fast. Remarkably, even when I=(x 1 2, x 2 2), one obtains a very interesting sequence, 0, 2, 3, 4, 6, 12, 924, 409620,…. This sequence is the same as H d− 1+ 1 for d≥ 2, where H d is the d th Hamilton number. The Hamilton numbers were studied by Hamilton and by Hammond and Sylvester because of their occurrence in a counting problem connected with the use of Tschirnhaus transformations in manipulating polynomial equations.
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DOI:
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发表时间:
1962
期刊:
影响因子:
--
作者:
É. Lucas
通讯作者:
É. Lucas
DOI:
--
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--
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作者:
Jeffrey Mermin;I. Peeva
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I. Peeva
影响因子:
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作者:
Draisma, Jan;Lason, Michal;Leykin, Anton
通讯作者:
Leykin, Anton
DOI:
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发表时间:
2007
期刊:
影响因子:
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作者:
Jeffrey Mermin;I. Peeva
通讯作者:
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DOI:
--
发表时间:
1999
期刊:
影响因子:
--
作者:
S. Iyengar;K. Pardue
通讯作者:
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