Subst/Setplus.thy

minor cleanup, added 'axclass', 'instance', 'syntax', 'defs' sections;

(*  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