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An Easy Road to Multi-contra-classicality.

Luis Estrada-González
Published in: Erkenntnis (2021)
A contra-classical logic is a logic that, over the same language as that of classical logic, validates arguments that are not classically valid. In this paper I investigate whether there is a single, non-trivial logic that exhibits many features of already known contra-classical logics. I show that Mortensen's three-valued connexive logic M3V is one such logic and, furthermore, that following the example in building M3V, that is, putting a suitable conditional on top of the { ∼ , ∧ , ∨ } -fragment of LP, one can get a logic exhibiting even more contra-classical features.
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