(***************************************************************************)
(* Formalization of the Chou, Gao and Zhang's decision procedure.          *)
(* Julien Narboux (Julien@narboux.fr)                                      *)
(* LIX/INRIA FUTURS 2004-2006                                              *)
(* University of Strasbourg 2008                                           *)
(***************************************************************************)
(** nine point circle *)

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.