src/CCL/Gfp.thy
author wenzelm
Wed, 03 Feb 1999 20:25:53 +0100
changeset 6219 b360065c2b07
parent 1474 3f7d67927fe2
child 17456 bcf7544875b2
permissions -rw-r--r--
check_thy: include ML stamp;
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
1474
3f7d67927fe2 expanded tabs
clasohm
parents: 0
diff changeset
     1
(*  Title:      HOL/gfp.thy
0
a5a9c433f639 Initial revision
clasohm
parents:
diff changeset
     2
    ID:         $Id$
1474
3f7d67927fe2 expanded tabs
clasohm
parents: 0
diff changeset
     3
    Author:     Lawrence C Paulson, Cambridge University Computer Laboratory
0
a5a9c433f639 Initial revision
clasohm
parents:
diff changeset
     4
    Copyright   1992  University of Cambridge
a5a9c433f639 Initial revision
clasohm
parents:
diff changeset
     5
a5a9c433f639 Initial revision
clasohm
parents:
diff changeset
     6
Greatest fixed points
a5a9c433f639 Initial revision
clasohm
parents:
diff changeset
     7
*)
a5a9c433f639 Initial revision
clasohm
parents:
diff changeset
     8
a5a9c433f639 Initial revision
clasohm
parents:
diff changeset
     9
Gfp = Lfp +
a5a9c433f639 Initial revision
clasohm
parents:
diff changeset
    10
consts gfp :: "['a set=>'a set] => 'a set"
a5a9c433f639 Initial revision
clasohm
parents:
diff changeset
    11
rules
a5a9c433f639 Initial revision
clasohm
parents:
diff changeset
    12
 (*greatest fixed point*)
a5a9c433f639 Initial revision
clasohm
parents:
diff changeset
    13
 gfp_def "gfp(f) == Union({u. u <= f(u)})"
a5a9c433f639 Initial revision
clasohm
parents:
diff changeset
    14
end