Strong completeness for iteration-free coalgebraic dynamic logics

Kupke, Clemens and Hansen, Helle Hvid and Leal, Raul Andres; Diaz, Josep and Lanese, Ivan and Sangiorgi, Davide, eds. (2014) Strong completeness for iteration-free coalgebraic dynamic logics. In: Theoretical Computer Science. Lecture Notes in Computer Science, 8705 . Springer, pp. 281-295. ISBN 978-3-662-44601-0 (

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We present a (co)algebraic treatment of iteration-free dynamic modal logics such as Propositional Dynamic Logic (PDL) and Game Logic (GL), both without star. The main observation is that the program/game constructs of PDL/GL arise from monad structure, and the axioms of these logics correspond to certain compatibilty requirements between the modalities and this monad structure. Our main contribution is a general soundness and strong completeness result for PDL-like logics for T-coalgebras where T is a monad and the "program" constructs are given by sequential composition, test, and pointwise extensions of operations of T.