Unification in intuitionistic logic

Journal of Symbolic Logic 64 (2):859-880 (1999)
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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DOI 10.2307/2586506
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Emil Jeřábek (2007). Complexity of Admissible Rules. Archive for Mathematical Logic 46 (2):73-92.
Silvio Ghilardi (2000). Best Solving Modal Equations. Annals of Pure and Applied Logic 102 (3):183-198.

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