doc-src/Tutorial/ToyList/lemma3
author wenzelm
Thu, 11 Nov 1999 11:58:51 +0100
changeset 8010 69032a618aa9
parent 5377 efb799c5ed3c
permissions -rw-r--r--
with_path;

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