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 give a direct proof of admissibility of cut and contraction for the contraction-free sequent calculus G4ip for intuitionistic propositional logic and for a corresponding multi-succedent calculus: ...
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