doc-src/Tutorial/ToyList/lemma3
author wenzelm
Fri, 21 May 1999 16:23:48 +0200
changeset 6694 335833a8b10a
parent 5377 efb799c5ed3c
permissions -rw-r--r--
added use_thy_only;

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