| author | convert-repo |
| Thu, 23 Jul 2009 14:03:20 +0000 | |
| changeset 255 | 435bf30c29a5 |
| parent 0 | 7949f97df77a |
| permissions | -rw-r--r-- |
| 0 | 1 |
(* Title: HOL/lfp.thy |
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ID: $Id$ |
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Author: Lawrence C Paulson, Cambridge University Computer Laboratory |
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Copyright 1992 University of Cambridge |
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The Knaster-Tarski Theorem |
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*) |
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Lfp = Sum + |
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consts lfp :: "['a set=>'a set] => 'a set" |
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rules |
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(*least fixed point*) |
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lfp_def "lfp(f) == Inter({u. f(u) <= u})"
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end |