Abstract
In this paper we present a sequent calculus for propositional dynamic logic built using an enriched version of the tree-hypersequent method and including an infinitary rule for the iteration operator. We prove that this sequent calculus is theoremwise equivalent to the corresponding Hilbert-style system, and that it is contraction-free and cut-free. All results are proved in a purely syntactic way.
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Hill, B., Poggiolesi, F. A Contraction-free and Cut-free Sequent Calculus for Propositional Dynamic Logic. Stud Logica 94, 47–72 (2010). https://doi.org/10.1007/s11225-010-9224-z
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DOI: https://doi.org/10.1007/s11225-010-9224-z