Proofs and types
The complexity of model checking for intuitionistic logics and their modal companions
RP'10 Proceedings of the 4th international conference on Reachability problems
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We find a translation with particularly nice properties from intuitionistic propositional logic in countably many variables to intuitionistic propositional logic in two variables. In addition, the existence of a possibly-not-as-nice translation from any countable logic into intuitionistic propositional logic in two variables is shown. The nonexistence of a translation from classical logic into intuitionistic propositional logic which preserves 驴 and 驴 but not necessarily 驴 is proven. These results about translations follow from additional results about embeddings into free Heyting algebras.