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src/HOL/IMP/Transition.thy
author wenzelm
Thu, 15 Nov 2001 18:20:13 +0100
changeset 12207 4dff931b852f
parent 9364 e783491b9a1f
child 12431 07ec657249e5
permissions -rw-r--r--
added Induct/Binary_Trees.thy, Induct/Tree_Forest (converted from former ex/TF.ML ex/TF.thy ex/Term.ML ex/Term.thy);

(*  Title:      HOL/IMP/Transition.thy
    ID:         $Id$
    Author:     Tobias Nipkow & Robert Sandner, TUM
    Copyright   1996 TUM

Transition semantics of commands
*)

Transition = Natural +

consts  evalc1    :: "((com*state)*(com*state))set"

syntax
        "@evalc1" :: "[(com*state),(com*state)] => bool"
                                ("_ -1-> _" [81,81] 100)
        "@evalcn" :: "[(com*state),nat,(com*state)] => bool"
                                ("_ -_-> _" [81,81] 100)
        "@evalc*" :: "[(com*state),(com*state)] => bool"
                                ("_ -*-> _" [81,81] 100)

translations
  "cs0 -1-> cs1"	== "(cs0,cs1) : evalc1"
  "cs0 -1-> (c1,s1)"	== "(cs0,c1,s1) : evalc1"

  "cs0 -n-> cs1" 	== "(cs0,cs1) : evalc1^n"
  "cs0 -n-> (c1,s1)" 	== "(cs0,c1,s1) : evalc1^n"

  "cs0 -*-> cs1" 	== "(cs0,cs1) : evalc1^*"
  "cs0 -*-> (c1,s1)" 	== "(cs0,c1,s1) : evalc1^*"


inductive evalc1
  intrs
    Assign "(x :== a,s) -1-> (SKIP,s[x ::= a s])"

    Semi1   "(SKIP;c,s) -1-> (c,s)"     
    Semi2   "(c0,s) -1-> (c2,s1) ==> (c0;c1,s) -1-> (c2;c1,s1)"

    IfTrue "b s ==> (IF b THEN c1 ELSE c2,s) -1-> (c1,s)"
    IfFalse "~b s ==> (IF b THEN c1 ELSE c2,s) -1-> (c2,s)"

    WhileFalse "~b s ==> (WHILE b DO c,s) -1-> (SKIP,s)"
    WhileTrue "b s ==> (WHILE b DO c,s) -1-> (c;WHILE b DO c,s)"

end
isabelle