src/HOL/Lfp.thy
author berghofe
Tue, 30 May 2000 18:02:49 +0200
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child 10212 33fe2d701ddd
permissions -rw-r--r--
the is now defined using primrec, avoiding explicit use of arbitrary.
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(*  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 = mono + Prod +
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constdefs
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  lfp :: ['a set=>'a set] => 'a set
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  "lfp(f) == Inter({u. f(u) <= u})"    (*least fixed point*)
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end