src/HOL/Lfp.thy
author wenzelm
Fri, 26 Oct 2001 23:58:21 +0200
changeset 11952 b10f1e8862f4
parent 11609 3f3d1add4d94
child 14169 0590de71a016
permissions -rw-r--r--
* Pure: method 'atomize' presents local goal premises as object-level statements (atomic meta-level propositions); setup controlled via rewrite rules declarations of 'atomize' attribute; example application: 'induct' method with proper rule statements in improper proof *scripts*;

(*  Title:      HOL/Lfp.thy
    ID:         $Id$
    Author:     Lawrence C Paulson, Cambridge University Computer Laboratory
    Copyright   1992  University of Cambridge

The Knaster-Tarski Theorem
*)

Lfp = Product_Type +

constdefs
  lfp :: ['a set=>'a set] => 'a set
  "lfp(f) == Inter({u. f(u) <= u})"    (*least fixed point*)

end