English

Quasi-Gorenstein (Normal) Finite Covers in Arbitrary Characteristic

Commutative Algebra 2025-03-28 v2

Abstract

We show that any complete local (normal) domain admits a module-finite quasi-Gorenstein normal (complete local) domain extension. In the geometric vein, we show that any normal projective variety XX over a field admits a finite surjective morphism YXY\rightarrow X from a normal quasi-Gorenstein projective variety YY. Notably, our results resolve the previously open case for residual characteristic two.

Keywords

Cite

@article{arxiv.2410.15149,
  title  = {Quasi-Gorenstein (Normal) Finite Covers in Arbitrary Characteristic},
  author = {Ehsan Tavanfar},
  journal= {arXiv preprint arXiv:2410.15149},
  year   = {2025}
}

Comments

Two sections are added. One section establishes the quasi-quasi-Gorenstein finite covers for projective varieties. The other one gives a converse to a result of Paul C. Roberts, with an application. Accepted for publication in the Proceedings of the American Mathematical Society