Notes on the behavior of the Ratliff-Rush filtration

Details Notes on the behavior of the Ratliff-Rush filtration Notes on the behavior of the Ratliff-Rush filtration

2002-09-23

arxiv.org/abs/math/0209308v1

Mathematics

Commutative Algebra

Scientific paper

We establish new classes of Ratliff-Rush closed ideals and some pathological behavior of the Ratliff-Rush closure. In particular, Ratliff-Rush closure does not behave well under passage modulo superficial elements, taking powers of ideals, associated primes, leading term ideals, and the minimal number of generators. In contrast, the reduction number of the Ratliff-Rush filtration behaves better: it preserves some information on the reduction number of the ideal.

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