F-coherent rings with applications to tight closure theory

Details F-coherent rings with applications to tight closure theory F-coherent rings with applications to tight closure theory

2009-08-05

arxiv.org/abs/0908.0630v1

Mathematics

Commutative Algebra

10 pages, comments are welcome

Scientific paper

The aim of this paper is to introduce a new class of Noetherian rings of positive characteristic in terms of perfect closures and study their basic properties. If the perfect closure of a Noetherian ring is coherent, we call it an $F$-coherent ring. Some interesting applications are given in connection with tight closure theory. In particular, we discuss relationships between $F$-coherent rings and $F$-pure, $F$-regular, and $F$-injective rings. The final section discusses how the coherent property effects the behavior of tight closure for general perfect rings.

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