Semiconic Idempotent Logic II: Beth Definability and Deductive Interpolation

TL;DR

This paper investigates the Beth definability and deductive interpolation properties in semiconic idempotent logic sCI and its extensions, linking algebraic properties of residuated lattices to logical interpolation results.

Contribution

It establishes the Beth definability and interpolation properties for many extensions of sCI by analyzing algebraic structures and their amalgamation properties.

Findings

Identifies classes of residuated lattices with strong amalgamation property.

Shows that certain subvarieties have surjective epimorphisms.

Derives interpolation and definability results for related logics.

Abstract

Semiconic idempotent logic sCI is a common generalization of intuitionistic logic, semilinear idempotent logic sLI, and in particular relevance logic with mingle. We establish the projective Beth definability property and the deductive interpolation property for many extensions of sCI, and identify extensions where these properties fail. We achieve these results by studying the (strong) amalgamation property and the epimorphism-surjectivity property for the corresponding algebraic semantics, viz. semiconic idempotent residuated lattices. Our study is made possible by the structural decomposition of conic idempotent models achieved in the prequel, as well as a detailed analysis of the structure of idempotent residuated chains serving as index sets in this decomposition. Here we study the latter on two levels: as certain enriched Galois connections and as enhanced monoidal preorders. Using this, we show that although conic idempotent residuated lattices do not have the amalgamation property, the natural class of rigid and conjunctive conic idempotent residuated lattices has the strong amalgamation property, and thus has surjective epimorphisms. This extends to the variety generated by rigid and conjunctive conic idempotent residuated lattices, and we establish the (strong) amalgamation and epimorphism-surjectivity properties for several important subvarieties. Using the algebraizability of sCI, this yields the deductive interpolation property and the projective Beth definability property for the corresponding substructural logics extending sCI.