doc-src/Tutorial/ToyList/lemma3
author wenzelm
Thu, 30 Sep 1999 23:31:13 +0200
changeset 7668 80c310e76c46
parent 5377 efb799c5ed3c
permissions -rw-r--r--
removed ProofContext.declare_thm;

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