| author | clasohm |
| Thu, 08 Dec 1994 12:50:38 +0100 | |
| changeset 199 | ad45e477926c |
| parent 178 | 12dd5d2e266b |
| 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 1994 University of Cambridge |
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Greatest fixed points (requires Lfp too!) |
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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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defs |
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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 |