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arXiv 0901.2394math.AC
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理想的Frobenius幂的准素分解的增长性

Growth of primary decompositions of Frobenius powers of ideals

Trung T. Dinh

摘要:

由史密斯-斯旺森和夏普-诺塞姆的工作可知,素特征环中理想的弗罗贝纽斯幂的准素分解的线性增长性质与紧闭包理论中的局部化问题有很强的联系。最近,布伦纳和蒙斯基以否定的方式解决了本地化问题,但线性增长问题仍然悬而未决。研究域上分次环中一维齐次理想的Frobenius幂的准素分解的增长性.如果环是正分次的,我们证明了线性增长性质成立。对于非负分次环,我们能够证明存在“多项式增长”。我们提出了明确的准素分解的Frobenius权力的理想,这是已知的有无限多个相关联的素数,具有这种线性增长的属性。我们还讨论了一些其他有趣的例子。

英文摘要:

It was previously known, by work of Smith-Swanson and of Sharp-Nossem, that the linear growth property of primary decompositions of Frobenius powers of ideals in rings of prime characteristic has strong connections to the localization problem in tight closure theory. The localization problem has recently been settled in the negative by Brenner and Monsky, but the linear growth question is still open. We study growth of primary decompositions of Frobenius powers of dimension one homogeneous ideals in graded rings over fields. If the ring is positively graded we prove that the linear growth property holds. For non-negatively graded rings we are able to show that there is a "polynomial growth". We present explicit primary decompositions of Frobenius powers of an ideal, which were known to have infinitely many associated primes, having this linear growth property. We also discuss some other interesting examples.

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