doc-src/Tutorial/ToyList/lemma3
author wenzelm
Sat, 04 Nov 2000 18:41:37 +0100
changeset 10392 f27afee8475d
parent 5377 efb799c5ed3c
permissions -rw-r--r--
tuned;

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