ex/puzzle.thy
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Wed, 02 Mar 1994 12:26:55 +0100
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(*  Title: 	HOL/ex/puzzle.thy
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    ID:         $Id$
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    Author: 	Tobias Nipkow
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    Copyright   1993 TU Muenchen
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An question from "Bundeswettbewerb Mathematik"
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*)
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Puzzle = Nat +
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consts f :: "nat => nat"
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rules  f_ax "f(f(n)) < f(Suc(n))"
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end