Section Upper_dim.
Context `{TnEQD:Tarski_neutral_dimensionless_with_decidable_point_equality}.
Definition upper_dim_axiom := forall A B C P Q : Tpoint,
P <> Q -> Cong A P A Q -> Cong B P B Q -> Cong C P C Q ->
(Bet A B C \/ Bet B C A \/ Bet C A B).
Definition all_coplanar_axiom := forall A B C D, Coplanar A B C D.

Lemma all_coplanar_upper_dim : all_coplanar_axiom <-> upper_dim_axiom.