src/HOL/Gfp.thy
author clasohm
Mon Feb 05 21:27:16 1996 +0100 (1996-02-05)
changeset 1475 7f5a4cd08209
parent 1370 7361ac9b024d
child 1558 9c6ebfab4e05
permissions -rw-r--r--
expanded tabs; renamed subtype to typedef;
incorporated Konrad's changes
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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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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