Re: [Haskell-cafe] Interest in typed relational algebra library?

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