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doc-src/TutorialI/Misc/fakenat.thy
author wenzelm
Sat, 20 Aug 2011 19:21:03 +0200
changeset 44333 cc53ce50f738
parent 16417 9bc16273c2d4
permissions -rw-r--r--
reverted to join_bodies/join_proofs based on fold_body_thms to regain performance (escpecially of HOL-Proofs) -- see also aa9c1e9ef2ce and 4e2abb045eac;
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(*<*)
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theory fakenat imports Main begin;
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(*>*)
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text{*\noindent








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The type \tydx{nat} of natural













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numbers is predefined to have the constructors \cdx{0} and~\cdx{Suc}.  It  behaves as if it were declared like this:








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*}













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datatype nat = 0 | Suc nat








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(*<*)













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end













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(*>*)















isabelle