Section par_perp_perp_TCP.
Context `{TnEQD:Tarski_neutral_dimensionless_with_decidable_point_equality}.

(* Specifications: *)
Lemma inter_dec_plus_par_perp_perp_imply_triangle_circumscription :
decidability_of_intersection ->
perpendicular_transversal_postulate ->
triangle_circumscription_principle.