doc-src/Tutorial/ToyList/lemma3
author wenzelm
Wed, 22 Sep 1999 21:45:35 +0200
changeset 7580 536499cf71af
parent 5377 efb799c5ed3c
permissions -rw-r--r--
tuned pretty_thms;

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