Section weak_tarski_s_parallel_postulate_weak_inverse_projection_postulate.
Context `{TnEQD:Tarski_neutral_dimensionless_with_decidable_point_equality}.
(** Formalization of a proof from Bachmann's article "Zur Parallelenfrage" *)

Lemma weak_tarski_s_parallel_postulate__weak_inverse_projection_postulate :
weak_tarski_s_parallel_postulate -> weak_inverse_projection_postulate.