(** 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 archi__obtuse_case_elimination :
archimedes_axiom ->
~ hypothesis_of_obtuse_saccheri_quadrilaterals.