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doc-src/Tutorial/Misc/NatSum.ML
author nipkow
Fri, 12 Nov 1999 17:45:36 +0100
changeset 8016 b7713108ffd8
parent 5377 efb799c5ed3c
permissions -rw-r--r--
Added the proof by Nielson & Nielson.
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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