doc-src/Tutorial/ToyList/lemma3
author paulson
Fri, 11 Dec 1998 10:41:53 +0100
changeset 6024 cb87f103d114
parent 5377 efb799c5ed3c
permissions -rw-r--r--
new Close_locale synatx

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