doc-src/Tutorial/ToyList/lemma3
author wenzelm
Tue, 12 Jan 1999 13:40:08 +0100
changeset 6091 e3cdbd929a24
parent 5377 efb799c5ed3c
permissions -rw-r--r--
eliminated tthm type and Attribute structure;

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