doc-src/Tutorial/ToyList/lemma3
author wenzelm
Tue, 16 Jan 2001 00:35:50 +0100
changeset 10914 aded4ba99b88
parent 5377 efb799c5ed3c
permissions -rw-r--r--
use_text etc.: proper output of error messages;

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