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arXiv 1808.09508math.ACmath.AG
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单项理想的Frobenius幂

Frobenius powers of some monomial ideals

Daniel J. Hernández, Pedro Teixeira, Emily E. Witt

摘要:

本文刻画了正特征多项式环的两类单式理想的(广义)Frobenius幂和临界指数:齐次极大理想的幂和由变量的正幂生成的理想.在这样做时,我们有效地表征测试理想和$F$跳跃指数的充分一般的齐次多项式,和所有的对角多项式。我们的特征使这些不变量变得可计算,并表明它们随着特征模固定整数的同余类而均匀变化。此外,我们确认,对特征为零的域上的对角多项式,其约简模素数的测试理想同意其乘子理想的无穷多个素数的约简。

英文摘要:

In this paper, we characterize the (generalized) Frobenius powers and critical exponents of two classes of monomial ideals of a polynomial ring in positive characteristic: powers of the homogeneous maximal ideal, and ideals generated by positive powers of the variables. In doing so, we effectively characterize the test ideals and $F$-jumping exponents of sufficiently general homogeneous polynomials, and of all diagonal polynomials. Our characterizations make these invariants computable, and show that they vary uniformly with the congruence class of the characteristic modulo a fixed integer. Moreover, we confirm that for a diagonal polynomial over a field of characteristic zero, the test ideals of its reduction modulo a prime agree with the reductions of its multiplier ideals for infinitely many primes.

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