The structure of F-pure rings

The structure of F-pure rings
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F-纯环的结构

DOI:
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发表时间:
2003
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通讯作者:
Florian Enescu
Florian Enescu
中科院分区:
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作者:
Ian M. Aberbach;Florian Enescu

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摘要:对于特征 p>0 且 q=pe 的约简 F-有限环 R,可以写出其中 Mq 在 R 上没有自由直接被加数。我们通过研究数字 aq 如何相对于 q 增长来研究 F-有限、F-纯环 R 的结构。这种增长是通过我们详细研究的 R 的分裂维度和分裂比率来量化的。我们还证明了 R 的特殊素数理想 (R) 的存在,称为分裂素数,它具有 R/(R) 强 F 正则的性质。我们表明,这种理想捕获了有关 R 的 F 纯度的重要信息。
Abstract.For a reduced F-finite ring R of characteristic p>0 and q=pe one can write where Mq has no free direct summands over R. We investigate the structure of F-finite, F-pure rings R by studying how the numbers aq grow with respect to q. This growth is quantified by the splitting dimension and the splitting ratios of R which we study in detail. We also prove the existence of a special prime ideal (R) of R, called the splitting prime, that has the property that R/(R) is strongly F-regular. We show that this ideal captures significant information with regard to the F-purity of R.