English

On the test properties of the Frobenius endomorphism

Commutative Algebra 2026-04-29 v1

Abstract

In this paper, we prove two theorems concerning the test properties of the Frobenius endomorphism over commutative Noetherian local rings of prime characteristic pp. Our first theorem generalizes a result of Funk-Marley on the vanishing of Ext and Tor modules, while our second theorem generalizes one of our previous results on maximal Cohen-Macaulay tensor products. In these earlier results, we replace eR^{e}R with a more general module eM^{e}M, where RR is a Cohen-Macaulay ring, MM is a Cohen-Macaulay RR-module with full support, and eM^{e}M is the module viewed as an RR-module via the ee-th iteration of the Frobenius endomorphism. We also provide examples and present applications of our results, yielding new characterizations of the regularity of local rings.

Keywords

Cite

@article{arxiv.2502.15048,
  title  = {On the test properties of the Frobenius endomorphism},
  author = {Olgur Celikbas and Arash Sadeghi and Yongwei Yao},
  journal= {arXiv preprint arXiv:2502.15048},
  year   = {2026}
}