RESUMO
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 { ⼠, ⧠, ⨠} -fragment of LP, one can get a logic exhibiting even more contra-classical features.
RESUMO
In this paper we show that, when analyzed with contemporary tools in logic-such as Dunn-style semantics, Reichenbach's three-valued logic exhibits many interesting features, and even new responses to some of the old objections to it can be attempted. Also, we establish some connections between Reichenbach's three-valued logic and some contra-classical logics.