Cohen-Macaulay approximations and the $\text{SC}_r$-condition
Commutative Algebra
2026-01-16 v3
Abstract
We study the relation between MCM approximations and FID hulls of modules over a Cohen-Macaulay local ring with canonical module, specifically when is generically Gorenstein. We then generalize a result of Kato, who proved that a Gorenstein complete local ring satisfies the -condition if and only if is a UFD. For , we prove a criterion for when an MCM -module satisfies the -condition, assuming that its first syzygy satisfies the -condition.
Cite
@article{arxiv.2507.14424,
title = {Cohen-Macaulay approximations and the $\text{SC}_r$-condition},
author = {Richard F. Bartels},
journal= {arXiv preprint arXiv:2507.14424},
year = {2026}
}
Comments
23 pages. Corrected statement of Proposition 2.4 (c). Revised Propositions 2.6, 2.8, and 2.9