Abstract
Regular varieties are defined by regular identities, where the same set of variables occurs on both sides. Therefore, we are not taking a wild guess if we assume that there must be some kinship between regular varieties and logics of variable inclusion, of which we have given a cursory preview in Section 1.4. The aim of the next two chapters is, on the one hand, to fully clarify the nature and extent of this connection; on the other, to lift the algebraic construction of Płonka sums to the level of logical matrices and to relate, in turn, these sums of matrices to logics of variable inclusion.
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Bonzio, S., Paoli, F., Pra Baldi, M. (2022). Logics of Left Variable Inclusion. In: Logics of Variable Inclusion. Trends in Logic, vol 59. Springer, Cham. https://doi.org/10.1007/978-3-031-04297-3_5
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DOI: https://doi.org/10.1007/978-3-031-04297-3_5
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