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doc-src/Tutorial/Misc/NatSum.ML
author wenzelm
Wed, 29 Sep 1999 13:54:31 +0200
changeset 7640 6b7daae5d316
parent 5377 efb799c5ed3c
permissions -rw-r--r--
added witness_sorts, univ_witness; removed nonempty_sort;
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5377
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Goal "sum n + sum n = n*(Suc n)";
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by(induct_tac "n" 1);
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by(Auto_tac);
isabelle