doc-src/Tutorial/ToyList/lemma3
author wenzelm
Fri, 03 Sep 1999 14:21:59 +0200
changeset 7447 d09f39cd3b6e
parent 5377 efb799c5ed3c
permissions -rw-r--r--
from hyp;

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