Kanger [4] gives a set of twelve axioms for the classical propositional Calculus which, together with modus ponens and substitution, have the following nice properties: (0.1) Each axiom contains ...
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 ...
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