(** 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}.

Lemma t22_18 :
archimedes_axiom ->
forall A0 B0 B1 A1, Saccheri A0 B0 B1 A1 -> ~ Lt B0 B1 A1 A0.