doc-src/TutorialI/ToyList2/ToyList2

 lemma app_Nil2 [simp]: "xs @ [] = xs";
 apply(induct_tac xs);
-apply(auto).;
+apply(auto);.;
 
 lemma app_assoc [simp]: "(xs @ ys) @ zs = xs @ (ys @ zs)";
 apply(induct_tac xs);
-apply(auto).;
+apply(auto);.;
 
 lemma rev_app [simp]: "rev(xs @ ys) = (rev ys) @ (rev xs)";
 apply(induct_tac xs);
-apply(auto).;
+apply(auto);.;
 
 theorem rev_rev [simp]: "rev(rev xs) = xs";
 apply(induct_tac xs);
-apply(auto).;
+apply(auto);.;
 
-end
+end;