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math.LO2026
Intuitionistic K is a Bisimulation-Invariant Fragment of Intuitionistic First-Order Logic
Jim de Groot, João Marcos, Rodrigo Stefanes
We define the notion of IK-bisimulation between the relational semantics for the intuitionistic modal logic IK, and prove that IK arises as the IK-bisimulation-invariant fragment o…
math.LO2026
Modal Measurable Logics via a Modal Loomis-Sikorski Representation Theorem
Nick Bezhanishvili, Jim de Groot, Lawrence S. Moss
We investigate a modal extension of the infinitary classical logic with countable meets and joins, formulated with an eye toward measure-theoretic work in dynamical systems and in…