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On Canonicity and Strong Completeness Conditions in Intermediate Propositional Logics

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Abstract

By using algebraic-categorical tools, we establish four criteria in order to disprove canonicity, strong completeness, w-canonicity and strong w-completeness, respectively, of an intermediate propositional logic. We then apply the second criterion in order to get the following result: all the logics defined by extra-intuitionistic one-variable schemata, except four of them, are not strongly complete. We also apply the fourth criterion in order to prove that the Gabbay-de Jongh logic D1 is not strongly w-complete.

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Ghilardi, S., Miglioli, P. On Canonicity and Strong Completeness Conditions in Intermediate Propositional Logics. Studia Logica 63, 353–385 (1999). https://doi.org/10.1023/A:1005203020752

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  • DOI: https://doi.org/10.1023/A:1005203020752

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