doc-src/Tutorial/ToyList/lemma3
author wenzelm
Sun, 25 Oct 1998 12:33:27 +0100
changeset 5769 6a422b22ba02
parent 5377 efb799c5ed3c
permissions -rw-r--r--
tuned checklist;

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