(** Test on_line_d in a ratio *)

(* Specifications: *)
Lemma test_on_line_d_11 : forall Y P Q A C D lambda,
on_line_d Y P Q lambda ->  C<>D -> parallel A Y C D ->
False -> A**Y/C**D =  1.
Lemma test_on_line_d_12 : forall Y P Q A C D lambda,
on_line_d Y P Q lambda ->  C<>D -> parallel Y A C D ->
False ->
Y**A/C**D = 1.