doc-src/Tutorial/ToyList/lemma3
author wenzelm
Thu, 14 Dec 2000 19:37:27 +0100
changeset 10673 337c00fd385b
parent 5377 efb799c5ed3c
permissions -rw-r--r--
unsymbolize;

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