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arXiv math/0604046math.ACmath.AG
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正特性绝对整闭包

Absolute integral closure in positive characteristic

Craig Huneke, Gennady Lyubeznik

摘要:

设R是局部正特征Noether整环. Hochster和Huneke(1992)的一个定理指出,如果R是优秀的,则R的绝对整闭包是一个大Cohen-Macaulay代数。证明了若R是Gorenstein局部环的同态像,则在该环的有限扩张中,该环的维数以下的所有局部上同调映射为零.结果将Hochster和Huneke的原始结果推广到R是Gorenstein局部环的同态像的情况,并在假设重叠的情况下,例如,完整的诺特局部域。

英文摘要:

Let R be a local Noetherian domain of positive characteristic. A theorem of Hochster and Huneke (1992) states that if R is excellent, then the absolute integral closure of R is a big Cohen-Macaulay algebra. We prove that if R is the homomorphic image of a Gorenstein local ring, then all the local cohomology (below the dimension) of such a ring maps to zero in a finite extension of the ring. There results an extension of the original result of Hochster and Huneke to the case in which R is a homomorphic image of a Gorenstein local ring, and a considerably simpler proof of this result in the cases where the assumptions overlap, e.g., for complete Noetherian local domains.

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