diff -r 36b165788421 -r 9ed0548177fb doc-src/TutorialI/ToyList2/ToyList2
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/doc-src/TutorialI/ToyList2/ToyList2	Wed Apr 19 13:40:42 2000 +0200
@@ -0,0 +1,17 @@
+lemma app_Nil2 [simp]: "xs @ [] = xs";
+apply(induct_tac xs);
+apply(auto).;
+
+lemma app_assoc [simp]: "(xs @ ys) @ zs = xs @ (ys @ zs)";
+apply(induct_tac xs);
+apply(auto).;
+
+lemma rev_app [simp]: "rev(xs @ ys) = (rev ys) @ (rev xs)";
+apply(induct_tac xs);
+apply(auto).;
+
+theorem rev_rev [simp]: "rev(rev xs) = xs";
+apply(induct_tac xs);
+apply(auto).;
+
+end