equationally defined

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Variety (universal algebra) — This article is about a class of algebraic structures of the same signature. For the set of solutions to a system of polynomial equations, see Algebraic variety. In mathematics, specifically universal algebra, a variety of algebras is the class… … Wikipedia
Monus — In mathematics, monus is a variant of subtraction that can be defined for certain commutative monoids that are not groups. The monus a − b of two elements a and b (also written with a dot above the minus sign) is defined in certain… … Wikipedia

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