Unification in intuitionistic logic

Journal of Symbolic Logic 64 (2):859-880 (1999)
Abstract
We show that the variety of Heyting algebras has finitary unification type. We also show that the subvariety obtained by adding it De Morgan law is the biggest variety of Heyting algebras having unitary unification type. Proofs make essential use of suitable characterizations (both from the semantic and the syntactic side) of finitely presented projective algebras
Keywords E-Unification   Projective Heyting Algebras   Exact Formulas   Admissible Inference Rules
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Emil Jeřábek (2006). Frege Systems for Extensible Modal Logics. Annals of Pure and Applied Logic 142 (1):366-379.

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