Section T10.
Context `{TnEQD:Tarski_neutral_dimensionless_with_decidable_point_equality}.
Goal forall A B C D, ~ Coplanar D C B A -> ~ Coplanar A B C D.

Lemma l10_2_uniqueness : forall A B P P1 P2,
Reflect P1 P A B -> Reflect P2 P A B -> P1=P2.