doc-src/Tutorial/ToyList/lemma3
author paulson
Sat, 03 Feb 2001 12:41:38 +0100
changeset 11042 bb566dd3f927
parent 5377 efb799c5ed3c
permissions -rw-r--r--
commutation theory, ported by Sidi Ehmety

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