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doc-src/Tutorial/ToyList/lemma3
author
paulson
Fri, 26 May 2000 18:05:34 +0200
changeset 8984
b71c460c6f97
parent 5377
efb799c5ed3c
permissions
-rw-r--r--
addss -> force_tac
Goal "(xs @ ys) @ zs = xs @ (ys @ zs)";
by(induct_tac "xs" 1);
by(Auto_tac);