(* Gabriel Braun November 2012 *)
Require Export GeoCoq.Tarski_dev.Ch12_parallel.
Section Quadrilateral.
Context `{TnEQD:Tarski_neutral_dimensionless_with_decidable_point_equality}.

Lemma midpoint_par_strict :
forall A B A' B' M,
A <> B ->
~ Col A B B' ->
Midpoint M A A' ->
Midpoint M B B' ->
Par_strict A B A' B'.