doc-src/Tutorial/ToyList/lemma3
author wenzelm
Wed, 20 Sep 2000 21:20:01 +0200
changeset 10039 1eb980d64ba3
parent 5377 efb799c5ed3c
permissions -rw-r--r--
tuned;

Goal "(xs @ ys) @ zs = xs @ (ys @ zs)";
by(induct_tac "xs" 1);
by(Auto_tac);