Abstract:Based on existence equations, quasivarieties of heterogeneous partial algebras have the same algebraic description as those of total algebras. Because of the restriction of the valuations to the free variables of a formula -the usual reference to the needed variables e.g. for identities (in order to get useful and manageable results) is essentially replaced here by the use of the "logical Craig projections" -already varieties of heterogeneous partial algebras behave to some extent rather like quasivarieties th… Show more
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