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src/ZF/Coind/Language.thy
author paulson
Thu, 01 Oct 1998 18:30:05 +0200
changeset 5601 b6456ccd9e3e
parent 2874 b1e7e2179597
child 6112 5e4871c5136b
permissions -rw-r--r--
revised for new treatment of integers

(*  Title:      ZF/Coind/Language.thy
    ID:         $Id$
    Author:     Jacob Frost, Cambridge University Computer Laboratory
    Copyright   1995  University of Cambridge
*)

Language = Datatype + QUniv +

consts
  Const :: i                    (* Abstract type of constants *)
  c_app :: [i,i] => i           (*Abstract constructor for fun application*)

rules
  constNEE  "c:Const ==> c ~= 0"
  c_appI    "[| c1:Const; c2:Const |] ==> c_app(c1,c2):Const"


consts
  Exp   :: i                    (* Datatype of expressions *)
  ExVar :: i                    (* Abstract type of variables *)
datatype <= "univ(Const Un ExVar)"
  "Exp" = e_const("c:Const")
        | e_var("x:ExVar")
        | e_fn("x:ExVar","e:Exp")
        | e_fix("x1:ExVar","x2:ExVar","e:Exp")
        | e_app("e1:Exp","e2:Exp")

end
isabelle