doc-src/Tutorial/ToyList/lemma3
author wenzelm
Mon, 04 Dec 2000 23:17:23 +0100
changeset 10581 74e542a299f0
parent 5377 efb799c5ed3c
permissions -rw-r--r--
dignostic commands: comment;

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