A completion of reduced commutative rings

Fuente: arXiv
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Autores principales: Carai, Luca, Kurtzhals, Miriam, Moraschini, Tommaso
Formato: Preprint
Publicado: 2026
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author Carai, Luca
Kurtzhals, Miriam
Moraschini, Tommaso
author_facet Carai, Luca
Kurtzhals, Miriam
Moraschini, Tommaso
contents A commutative ring is reduced when it can be embedded into a direct product of fields. While the category of reduced commutative rings plays a fundamental role in affine geometry, it exhibits several structural deficiencies: it admits nonregular monomorphisms and epimorphisms, lacks amalgamation, and is not equationally axiomatizable. In this paper, we simultaneously repair these defects via a canonical completion in which all monomorphisms become regular. This completion is obtained by adjoining weak inverses and weak prime roots, turning the class of reduced commutative rings into a discriminator variety. As a consequence, we obtain an explicit description of dominions in every class of reduced commutative rings containing all fields. This description is strikingly simple compared to that of dominions in the category of all commutative rings, as reflected in the Isbell-Mazet-Silver Zigzag Theorem.
format Preprint
id arxiv_https___arxiv_org_abs_2605_12661
institution arXiv
publishDate 2026
record_format arxiv
spellingShingle A completion of reduced commutative rings
Carai, Luca
Kurtzhals, Miriam
Moraschini, Tommaso
Rings and Algebras
Logic
03C05, 18A20, 12F99, 13A99
A commutative ring is reduced when it can be embedded into a direct product of fields. While the category of reduced commutative rings plays a fundamental role in affine geometry, it exhibits several structural deficiencies: it admits nonregular monomorphisms and epimorphisms, lacks amalgamation, and is not equationally axiomatizable. In this paper, we simultaneously repair these defects via a canonical completion in which all monomorphisms become regular. This completion is obtained by adjoining weak inverses and weak prime roots, turning the class of reduced commutative rings into a discriminator variety. As a consequence, we obtain an explicit description of dominions in every class of reduced commutative rings containing all fields. This description is strikingly simple compared to that of dominions in the category of all commutative rings, as reflected in the Isbell-Mazet-Silver Zigzag Theorem.
title A completion of reduced commutative rings
topic Rings and Algebras
Logic
03C05, 18A20, 12F99, 13A99
url https://arxiv.org/abs/2605.12661