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ex/Puzzle.thy
author lcp
Thu, 07 Oct 1993 10:29:23 +0100
changeset 6 4448d76f87ef
parent 0 7949f97df77a
permissions -rw-r--r--
used ~= for "not equals" and ~: for "not in"

(*  Title: 	HOL/ex/puzzle.thy
    ID:         $Id$
    Author: 	Tobias Nipkow
    Copyright   1993 TU Muenchen

An question from "Bundeswettbewerb Mathematik"
*)

Puzzle = Nat +
consts f :: "nat => nat"
rules  f_ax "f(f(n)) < f(Suc(n))"
end
Old_HOL