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Subst/Setplus.thy
author lcp
Wed, 25 May 1994 13:03:19 +0200
changeset 77 d64593bb95d3
parent 0 7949f97df77a
permissions -rw-r--r--
HOL/Arith: definition of diff now uses pred, not nat_rec

(*  Title: 	Substitutions/setplus.thy
    Author: 	Martin Coen, Cambridge University Computer Laboratory
    Copyright   1993  University of Cambridge

Minor additions to HOL's set theory
*)

Setplus = Set + 

rules

  ssubset_def    "A < B == A <= B & ~ A=B"

end
Old_HOL