doc-src/Tutorial/ToyList/lemma3
author wenzelm
Fri, 01 Mar 2002 16:59:48 +0100
changeset 12997 80dec7322a8c
parent 5377 efb799c5ed3c
permissions -rw-r--r--
tuned;

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