doc-src/Tutorial/ToyList/lemma3
author wenzelm
Wed, 18 Nov 1998 11:12:29 +0100
changeset 5930 41aa67a045f7
parent 5377 efb799c5ed3c
permissions -rw-r--r--
exn_message FAIL;

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