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Duality for Constructive Modal Logics: from Sahqlvist to Goldblatt-Thomason

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abstract

We carry out a semantic study of the constructive modal logic CK. We provide a categorical duality linking the algebraic and birelational semantics of the logic. We then use this to prove Sahlqvist style correspondence and completeness results, as well as a Goldblatt-Thomason style theorem on definability of classes of frames.

fields

cs.LO 1

years

2026 1

verdicts

UNVERDICTED 1

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Four intuitionistic modal connectives

cs.LO · 2026-06-05 · unverdicted · novelty 5.0

Introduces four intuitionistic modal connectives, analyzes definability of frame classes, studies complete axiomatizations, and proves decidability of the minimal logic over all frames.

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  • Four intuitionistic modal connectives cs.LO · 2026-06-05 · unverdicted · none · ref 20 · internal anchor

    Introduces four intuitionistic modal connectives, analyzes definability of frame classes, studies complete axiomatizations, and proves decidability of the minimal logic over all frames.