Subst/Setplus.thy

changed "." to "$" and Cons to infix "#" to eliminate ambiguity

(*  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