On Strong Structural Completeness of Varieties and Quasivarieties

We study structural completeness in the infinitary sense (strong structural completeness) in an algebraic setting.A variety is structurally complete (SCpl) if it is generated, as a quasivariety, by its free algebras, and it is strongly structurally complete (SSCpl) if it is generated, as a prevariety, by its free algebras.A quasivariety is SSCpl if it is generated, as a prevariety, by its free algebras.We prove that every quasivariety of finite type with the CEP that is generated by finite algebras and contains an infinite irreducible algebra is not SSCpl.Moreover, every congruence meetsemidistributive variety of finite type generated by finite algebras is SSCpl if and only if it is tabular.Thus, Dummett's and Medvedev's logics are SCpl but not SSCpl.A variety is primitive if it is SCpl and all its subvarieties are SCpl; it is strongly primitive if it is SSCpl and all its subvarieties are SSCpl.We prove that in primitive congruence-distributive varieties of finite type, the tabular subvarieties, and only those, are strongly primitive.This observation also yields a criterion for strong primitivity.