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Two-dimensional Kripke Semantics II: Stability and Completeness

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arxiv 2406.03578 v3 pith:MAFYUKD4 submitted 2024-06-05 cs.LO math.CTmath.LO

classification cs.LOmath.CTmath.LO
keywords semanticsalgebraicstablekripkedualityintuitionisticleadsmodels
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We revisit the duality between Kripke and algebraic semantics of intuitionistic and intuitionistic modal logic. We find that there is a certain mismatch between the two semantics, which means that not all algebraic models can be embedded into a Kripke model. This leads to an alternative proposal for a relational semantics, the stable semantics. Instead of an arbitrary partial order, the stable semantics requires a distributive lattice of worlds. We constructively show that the stable semantics is exactly as complete as the algebraic semantics. Categorifying these results leads to a 2-duality between two-dimensional stable semantics and categories of product-preserving presheaves, i.e. models of algebraic theories in the style of Lawvere.

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Cited by 1 Pith paper

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  1. Bicategories of algebras for relative pseudomonads

    math.CT 2025-01 accept novelty 7.0 of 10

    For each relative pseudomonad T, the paper builds a terminal bicategory of T-pseudoalgebras, embeds the Kleisli bicategory into it, and characterizes pseudoalgebras for free cocompletion pseudomonads as cocomplete categories.

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