Preprint
Sep 2026
A decision procedure for intuitionistic modal logic IS4 (and IK4)
In this paper, we show that the two intuitionistic modal logics IS4 and IK4 are decidable. We provide a constructive decision procedure, that, given a formula, produces either a proof showing the formula to be valid or a finite countermodel falsifying the formula, thus also proving the finite model property for both lo...
Marianna Girlando, Roman Kuznets, Sonia Marin et al.
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