doc-src/TutorialI/Misc/arith3.thy
author wenzelm
Mon, 23 Oct 2000 11:14:00 +0200
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(*<*)
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theory arith3 = Main:;
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(*>*)
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lemma "n*n = n \\<Longrightarrow> n=0 \\<or> n=1";
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(**)(*<*)
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oops;
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end
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(*>*)