Studia Logica: An International Journal for Symbolic Logic, Vol. 102, No. 6, Gentzen's and Jaśkowski's Heritage 80 Years of Natural Deduction and Sequent Calculi (December 2014), pp. 1185-1216 (32 ...
We attempt to define the classical propositional logic by use of appropriate derivability conditions called Cn-definitions. The conditions characterize basic properties of propositional connectives.
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