doc-src/Tutorial/ToyList/lemma3
author nipkow
Tue, 30 Mar 1999 13:17:55 +0200
changeset 6406 0f6076dca737
parent 5377 efb799c5ed3c
permissions -rw-r--r--
arith_tac

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