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(* Title: ZF/Coind/Language.thy
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ID: $Id$
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Author: Jacob Frost, Cambridge University Computer Laboratory
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Copyright 1995 University of Cambridge
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*)
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Language ="Datatype" + QUniv +
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consts
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Const :: i (* Abstract type of constants *)
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c_app :: [i,i] => i (*Abstract constructor for fun application*)
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rules
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constNEE "c:Const ==> c ~= 0"
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c_appI "[| c1:Const; c2:Const |] ==> c_app(c1,c2):Const"
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consts
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Exp :: i (* Datatype of expressions *)
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ExVar :: i (* Abstract type of variables *)
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datatype <= "univ(Const Un ExVar)"
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"Exp" = e_const("c:Const")
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| e_var("x:ExVar")
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| e_fn("x:ExVar","e:Exp")
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| e_fix("x1:ExVar","x2:ExVar","e:Exp")
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| e_app("e1:Exp","e2:Exp")
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end
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