src/HOL/Gfp.thy
author berghofe
Tue, 30 May 2000 18:02:49 +0200
changeset 9001 93af64f54bf2
parent 8882 9df44a4f1bf7
child 14169 0590de71a016
permissions -rw-r--r--
the is now defined using primrec, avoiding explicit use of arbitrary.

(*  Title:      HOL/gfp.thy
    ID:         $Id$
    Author:     Lawrence C Paulson, Cambridge University Computer Laboratory
    Copyright   1994  University of Cambridge

Greatest fixed points (requires Lfp too!)
*)

Gfp = Lfp +

constdefs
  gfp :: ['a set=>'a set] => 'a set
  "gfp(f) == Union({u. u <= f(u)})"    (*greatest fixed point*)

end