Studia Logica: An International Journal for Symbolic Logic, Vol. 48, No. 4 (1989), pp. 449-459 (11 pages) We prove that the intuitionistic sentential calculus is Ł-decidable (decidable in the sense of ...

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: ...

Logic is among the oldest and most foundational of the university disciplines. The goal is to equip students with most general possible framework for sound and rigorous reasoning — one that works ...