(** nine point circle *)

(* Specifications: *)
Lemma l_6_134 : forall A B C M D E F I J,
on_foot M A B C ->
is_midpoint D B C ->
is_midpoint E A C ->
is_midpoint F A B ->
is_midpoint I E F ->
is_midpoint J M D ->
B<>C ->
parallel I J A M.