src/CCL/gfp.thy
author lcp
Thu, 08 Sep 1994 11:05:06 +0200
changeset 590 800603278425
parent 0 a5a9c433f639
permissions -rw-r--r--
{HOL,ZF}/indrule/quant_induct: replaced ssubst in eresolve_tac by separate call to hyp_subst_tac. This avoids substituting in x=f(x) {HOL,ZF}/indrule/ind_tac: now tries resolve_tac [refl]. This handles trivial equalities such as x=a. {HOL,ZF}/intr_elim/intro_tacsf_tac: now calls assume_tac last, to try refl before any equality assumptions

(*  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