Require Export E4_Continuite.
Section PARALLEL.
(* For each point P and each line D, there exists at most one line through P parallel to D. *)

(* Specifications: *)
Theorem Parallel_exists : forall A : Point, forall (F : Figure) (D : Line F),
exists F' : Figure, (exists D' : Line F', ParallelLines F F' D D' /\ F' A).