| author | aspinall | 
| Fri, 01 Oct 2004 11:51:55 +0200 | |
| changeset 15220 | cc88c8ee4d2f | 
| parent 15140 | 322485b816ac | 
| child 15381 | 780ea4c697f2 | 
| permissions | -rw-r--r-- | 
| 1475 | 1 | (* Title: HOL/gfp.thy | 
| 923 | 2 | ID: $Id$ | 
| 1475 | 3 | Author: Lawrence C Paulson, Cambridge University Computer Laboratory | 
| 923 | 4 | Copyright 1994 University of Cambridge | 
| 5 | ||
| 6 | Greatest fixed points (requires Lfp too!) | |
| 7 | *) | |
| 8 | ||
| 15131 | 9 | theory Gfp | 
| 15140 | 10 | imports Lfp | 
| 15131 | 11 | begin | 
| 1558 | 12 | |
| 13 | constdefs | |
| 14169 | 14 | gfp :: "['a set=>'a set] => 'a set" | 
| 1558 | 15 |   "gfp(f) == Union({u. u <= f(u)})"    (*greatest fixed point*)
 | 
| 16 | ||
| 923 | 17 | end |