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Extensions of Priest-da Costa Logic

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Abstract

In this paper, we look at applying the techniques from analyzing superintuitionistic logics to extensions of the cointuitionistic Priest-da Costa logic daC (introduced by Graham Priest as “da Costa logic”). The relationship between the superintuitionistic axioms- definable in daC- and extensions of Priest-da Costa logic (sdc-logics) is analyzed and applied to exploring the gap between the maximal si-logic SmL and classical logic in the class of sdc-logics. A sequence of strengthenings of Priest-da Costa logic is examined and employed to pinpoint the maximal non-classical extension of both daC and Heyting-Brouwer logic HB . Finally, the relationship between daC and Logics of Formal Inconsistency is examined.

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Correspondence to Thomas Macaulay Ferguson.

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Ferguson, T.M. Extensions of Priest-da Costa Logic. Stud Logica 102, 145–174 (2014). https://doi.org/10.1007/s11225-013-9469-4

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