src/HOL/Lfp.thy
author nipkow
Wed, 18 Aug 2004 11:09:40 +0200
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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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theory Lfp
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imports Product_Type
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begin
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constdefs
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  lfp :: "['a set \<Rightarrow> 'a set] \<Rightarrow> 'a set"
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  "lfp(f) == Inter({u. f(u) <= u})"    (*least fixed point*)
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end