| author | lcp |
| Tue, 18 Jan 1994 15:57:40 +0100 | |
| changeset 230 | ec8a2b6aa8a7 |
| parent 0 | a5a9c433f639 |
| permissions | -rw-r--r-- |
| 0 | 1 |
(* Title: HOL/gfp.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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Greatest fixed points |
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*) |
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Gfp = Lfp + |
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consts gfp :: "['a set=>'a set] => 'a set" |
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rules |
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(*greatest fixed point*) |
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gfp_def "gfp(f) == Union({u. u <= f(u)})"
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end |