Definition of "quasivarieties" []

• Plural form of quasivariety. (noun)

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• "Much as abstract algebra numbers groups, rings, and fields among its basic classes, so does universal algebra count varieties, quasivarieties, and elementary classes among its basic classes of classes."
• "The majority of classes of algebras that provide semantics for propositional logics are quasivarieties and in most cases varieties."
• "Moreover, different quasivarieties of algebras can be a"