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arXiv 2105.07186math.AC
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约化数3的整闭理想

Integrally closed ideals of reduction number three

Shinya Kumashiro

摘要:

在Cohen-Macaulay局部环$(A, \mathfrak{m})$中,研究了约化数为3的整闭$\mathfrak{m}$ -准素理想$I$的Hilbert函数.在较弱的假设下,我们给出了一个不等式$\ell_A(A/I) \ge \mathrm{e}_0(I) - \mathrm{e}_1(I) + \dfrac{\mathrm{e}_2(I) + \ell_A(I^2/QI)}{2}$,其中$\mathrm{e}_i(I)$表示$i$阶Hilbert系数,$Q$表示$I$的最小约化.该不等式介于Itoh不等式和Elias-Valla不等式之间。进一步,我们的不等式成为等式当且仅当$I$的伴随分次环的深度大于或等于$\dim A-1$ .我们还研究了行列式环的伴随分次环的Cohen-Macaulay性。

英文摘要:

In a Cohen-Macaulay local ring $(A, \mathfrak{m})$, we study the Hilbert function of an integrally closed $\mathfrak{m}$-primary ideal $I$ whose reduction number is three. With a mild assumption we give an inequality $\ell_A(A/I) \ge \mathrm{e}_0(I) - \mathrm{e}_1(I) + \dfrac{\mathrm{e}_2(I) + \ell_A(I^2/QI)}{2}$, where $\mathrm{e}_i(I)$ denotes the $i$th Hilbert coefficients and $Q$ denotes a minimal reduction of $I$. The inequality is located between inequalities of Itoh and Elias-Valla. Furthermore our inequality becomes an equality if and only if the depth of the associated graded ring of $I$ is larger than or equal to $\dim A-1$. We also study the Cohen-Macaulayness of the associated graded rings of determinantal rings.

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