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arXiv 2004.03831math.AC
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素特征行列式理想的符号幂

Symbolic powers of determinantal ideals in prime characteristic

Jonathan Montaño, Luis Núñez-Betancourt

摘要:

我们研究了一般的,一般的对称的,和汉克尔矩阵的变量,和一般的反对称矩阵的Pfweans,在素特征的行列式理想的符号权力。具体来说,我们表明,极限$\lim\limits_{n\to\infty} \frac{\textrm{reg}(I^{(n)})}{n}$存在,$\textrm{depth}(R/I^{(n)})$稳定$n\gg 0$。此外,我们给出了一般和反对称情形下$\textrm{depth}(R/I^{(n)})$稳定值的显式公式。为了证明这些结果,我们引入了理想的符号$F$ -纯性的概念,它满足上述理想类。此外,我们还发现了符号$F$ -纯理想所满足的几个性质。例如,我们证明了它们的符号Rees代数和符号伴随分次代数是$F$ -纯的.因此,它们的$a$ -不变量和深度表现出良好的行为。此外,我们提供了一个Fedder的符号$F$纯度的标准。

英文摘要:

We study the symbolic powers of determinantal ideals of generic, generic symmetric, and Hankel matrices of variables, and of Pfaffians of generic skew-symmetric matrices, in prime characteristic. Specifically, we show that the limit $\lim\limits_{n\to\infty} \frac{\textrm{reg}(I^{(n)})}{n}$ exists and that $\textrm{depth}(R/I^{(n)})$ stabilizes for $n\gg 0$. Furthermore, we give explicit formulas for the stable value of $\textrm{depth}(R/I^{(n)})$ in the generic and skew-symmetric cases. In order to show these results, we introduce the notion of symbolic $F$-purity of ideals which is satisfied by the classes of ideals mentioned above. Moreover, we find several properties satisfied by symbolic $F$-pure ideals. For example, we show that their symbolic Rees algebras and symbolic associated graded algebras are $F$-pure. As a consequence, their $a$-invariants and depths present good behaviors. In addition, we provide a Fedder's-like Criterion for symbolic $F$-purity.

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