On structural completeness vs almost structural completeness problem: A discriminator varieties case study

Miguel Campercholi; Michal M. Stronkowski; Diego Vaggione

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arXiv · 1407.0175

On structural completeness vs almost structural completeness problem: A discriminator varieties case study

Miguel Campercholi·Michal M. Stronkowski·Diego Vaggione

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Abstract

We study the following problem: Determine which almost structurally complete quasivarieties are structurally complete. We propose a general solution to this problem and then a solution in the semisimple case. As a consequence, we obtain a characterization of structurally complete discriminator varieties. An interesting corollary in logic follows: Let $L$ be a consistent propositional logic/deductive system in the language with formulas for verum, which is a theorem, and falsum, which is not a theorem. Assume also that $L$ has an adequate semantics given by a discriminator variety. Then $L$ is structurally complete if and only if it is maximal. All such logics/deductive systems are almost structurally complete.

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BibTeX RIS

Miguel Campercholi, Michal M. Stronkowski, Diego Vaggione. 2014-08-20. On structural completeness vs almost structural completeness problem: A discriminator varieties case study. https://arxiv.org/abs/1407.0175

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