(* Gabriel Braun April 2013 *)
Require Export GeoCoq.Tarski_dev.Ch12_parallel.
Section L13_1.
Context `{TnEQD:Tarski_neutral_dimensionless_with_decidable_point_equality}.
(** Pappus Desargues *)

Lemma triangle_mid_par : forall A B C P Q, ~Col A B C -> Midpoint P B C -> Midpoint Q A C -> Par_strict A B Q P.