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: HOL/gfp.thy
ID: $Id$
Author: Lawrence C Paulson, Cambridge University Computer Laboratory
Copyright 1992 University of Cambridge
Greatest fixed points
*)
Gfp = Lfp +
consts gfp :: "['a set=>'a set] => 'a set"
rules
(*greatest fixed point*)
gfp_def "gfp(f) == Union({u. u <= f(u)})"
end