HOL/ind_syntax/factors: now returns only factors in the product type that
associate to the right. Previously the proof of the induction rule
crashed on types such as (bool*bool)*bool.
(* 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