(* Contribution to the Coq Library   V6.3 (July 1999)                    *)
(****************************************************************************)
(*                                                                          *)
(*                          Constructive Geometry                           *)
(*                             according to                                 *)
(*                            Jan von Plato                                 *)
(*                                                                          *)
(*                               Coq V5.10                                  *)
(*									    *)
(*			        Gilles Kahn 				    *)
(*				   INRIA                                    *)
(*		              Sophia-Antipolis		 	            *)
(*									    *)
(*                                                                          *)
(* Acknowledgments: This work started in Turin in May 95 with Yves Bertot.  *)
(* Thanks to the Newton Institute for providing an exceptional work         *)
(* environment in Summer 1995 so that I could complete this.                *)
(****************************************************************************)
(****************************************************************************)
(*                               part1.v                                    *)
(*                                                                          *)
(* Congruence lemmas near the end slightly more explicit than in von Plato  *)
(****************************************************************************)
Hint Resolve Convergent_imp_distinct.

Theorem cong_eqln_inc :
forall (a : Point) (l m : Line), Incident a l -> EqLn l m -> Incident a m.