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doc-src/Tutorial/ToyList/lemma3
author
wenzelm
Wed, 09 Jun 2004 18:56:55 +0200
changeset 14912
88b9d9165452
parent 5377
efb799c5ed3c
permissions
-rw-r--r--
added split_ext; removed drop_ext;
Goal "(xs @ ys) @ zs = xs @ (ys @ zs)";
by(induct_tac "xs" 1);
by(Auto_tac);