src/HOL/Gfp.thy
author berghofe
Tue, 30 May 2000 18:02:49 +0200
changeset 9001 93af64f54bf2
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child 14169 0590de71a016
permissions -rw-r--r--
the is now defined using primrec, avoiding explicit use of arbitrary.
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(*  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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constdefs
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  gfp :: ['a set=>'a set] => 'a set
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  "gfp(f) == Union({u. u <= f(u)})"    (*greatest fixed point*)
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end