We investigate 3-permutability, in the sense of universal algebra, in an abstract categorical setting which unifies the pointed and the non-pointed contexts in categorical algebra. This leads to a unified treatment of regular subtractive categories and of regular Goursat categories, as well as of E-subtractive varieties (where E is the set of constants in a variety) recently introduced by the fourth author. As an application, we show that \ideals" coincide with \clots" in any regular subtractive category, which can be considered as a pointed analogue of a known result for regular Goursat categories.

Gran, M., Janelidze, Z., Rodelo, D., Ursini, A. (2012). Symmetry of regular diamonds, the Goursat property, and subtractivity. THEORY AND APPLICATIONS OF CATEGORIES, 27(6), 80-96 [10.1007/s10485-005-0934-8].

Symmetry of regular diamonds, the Goursat property, and subtractivity

URSINI, ALDO
2012-01-01

Abstract

We investigate 3-permutability, in the sense of universal algebra, in an abstract categorical setting which unifies the pointed and the non-pointed contexts in categorical algebra. This leads to a unified treatment of regular subtractive categories and of regular Goursat categories, as well as of E-subtractive varieties (where E is the set of constants in a variety) recently introduced by the fourth author. As an application, we show that \ideals" coincide with \clots" in any regular subtractive category, which can be considered as a pointed analogue of a known result for regular Goursat categories.
2012
Gran, M., Janelidze, Z., Rodelo, D., Ursini, A. (2012). Symmetry of regular diamonds, the Goursat property, and subtractivity. THEORY AND APPLICATIONS OF CATEGORIES, 27(6), 80-96 [10.1007/s10485-005-0934-8].
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11365/974757