(* Julien Narboux *)
(* Formalization of *)
(* Tarski's axiomatic *)
Require Export  Ch01_tarski_axioms.
(** Some basic properties about Cong. *)

Lemma cong_symmetry : forall A B C D : Point, Cong A B C D -> Cong C D A B.
Hint Immediate cong_symmetry : sTarski.