doc-src/Tutorial/ToyList/lemma3
author wenzelm
Tue, 05 Oct 1999 15:26:10 +0200
changeset 7714 e6aa4fca983e
parent 5377 efb799c5ed3c
permissions -rw-r--r--
added position;

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