> And yes to first order predicate calculus too!
Just two weeks ago Chung-chieh Shan and I were explaining at NASSLLI
the embedding in Haskell of the higher-order predicate logic with two
base types (so-called Ty2). The embedding supports type-safe
simplification of formulas (which was really needed for our
applications). The embedding is extensible: you can add models and
more constants.
http://okmij.org/ftp/gengo/NASSLLI10/course.html#semantics
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