src/HOLCF/Void.thy
author oheimb
Wed, 18 Dec 1996 15:16:13 +0100
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removed Holcfb.thy and Holcfb.ML, moving classical3 to HOL.ML as classical2
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(*  Title:      HOLCF/void.thy
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    ID:         $Id$
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    Author:     Franz Regensburger
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    Copyright   1993  Technische Universitaet Muenchen
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Definition of type void with partial order. Void is the prototype for
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all types in class 'po'
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Type void  is defined as a set Void over type bool.
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*)
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Void = Nat +
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types void 0
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arities void :: term
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consts
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  Void          :: "bool set"
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  UU_void_Rep   :: "bool"       
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  Rep_Void      :: "void => bool"
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  Abs_Void      :: "bool => void"
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  UU_void       :: "void"
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  less_void     :: "[void,void] => bool"        
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defs
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  (* The unique element in Void is False:bool *)
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  UU_void_Rep_def       "UU_void_Rep == False"
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  Void_def              "Void == {x. x = UU_void_Rep}"
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   (*defining the abstract constants*)
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  UU_void_def   "UU_void == Abs_Void(UU_void_Rep)"  
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  less_void_def "less_void x y == (Rep_Void x = Rep_Void y)"  
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rules
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  (*faking a type definition... *)
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  (* void is isomorphic to Void *)
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  Rep_Void              "Rep_Void(x):Void"              
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  Rep_Void_inverse      "Abs_Void(Rep_Void(x)) = x"     
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  Abs_Void_inverse      "y:Void ==> Rep_Void(Abs_Void(y)) = y"
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end
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