(** This development is inspired by The Foundations of Geometry and the Non-Euclidean Plane, by George E Martin, chapter 22 *)
Section Archimedes.
Context `{TnEQD:Tarski_neutral_dimensionless_with_decidable_point_equality}.

(** For every n, B0Bn is lower than or equal to n times B0B1 *)
Lemma t22_18_aux2 : forall A0 A1 B0 B1 A B E,
Saccheri A0 B0 B1 A1 ->
Grad2 A0 A1 A B0 B1 E -> Saccheri A0 B0 B A -> Le B0 B B0 E.