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arXiv math/0402180math.ACmath.AG
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分次维数2中Hilbert-Kunz重数的合理性

The rationality of the Hilbert-Kunz multiplicity in graded dimension two

Holger Brenner

摘要:

证明了对于R_+-准素齐次理想I=(f_1,. f_n)在正特征的代数闭域上的有限型二维分次域R中的.此外,我们还给出了合冲丛Syz(f_1,.)的强Harder-Narasimhan滤的某些有理数的Hilbert-Kunz重数公式。. ., f_n)在射影曲线Y = Proj R上的投影。

英文摘要:

We show that the Hilbert-Kunz multiplicity is a rational number for an R_+-primary homogeneous ideal I=(f_1, ..., f_n) in a two-dimensional graded domain R of finite type over an algebraically closed field of positive characteristic. Moreover we give a formula for the Hilbert-Kunz multiplicity in terms of certain rational numbers coming from the strong Harder-Narasimhan filtration of the syzygy bundle Syz(f_1, . . ., f_n) on the projective curve Y = Proj R.

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