Geodesic
On sequent calculi for intuitionistic propositional logic
Commentationes Mathematicae Universitatis Carolinae, Tome 47 (2006) no. 1, pp. 159-173.

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The well-known Dyckoff's 1992 calculus/procedure for intuitionistic propositional logic is considered and analyzed. It is shown that the calculus is Kripke complete and the procedure in fact works in polynomial space. Then a multi-conclusion intuitionistic calculus is introduced, obtained by adding one new rule to known calculi. A simple proof of Kripke completeness and polynomial-space decidability of this calculus is given. An upper bound on the depth of a Kripke counter-model is obtained.
Classification : 03B20, 03B35, 03F05, 03F20
Keywords: intuitionistic logic; polynomial-space; sequent calculus; Kripke semantics 
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Švejdar, Vítězslav. On sequent calculi for intuitionistic propositional logic. Commentationes Mathematicae Universitatis Carolinae, Tome 47 (2006) no. 1, pp. 159-173. http://geodesic.mathdoc.fr/item/CMUC_2006__47_1_a14/