--- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/doc-src/Tutorial/ToyList/lemma3 Wed Aug 26 17:27:27 1998 +0200 @@ -0,0 +1,3 @@ +Goal "(xs @ ys) @ zs = xs @ (ys @ zs)"; +by(induct_tac "xs" 1); +by(Auto_tac);