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 is_image_spec_col_cong : forall A B P P' X,
ReflectL P P' A B -> Col A B X -> Cong P X P' X.