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 image_image_in : forall A B P P' M,
P <> P'-> ReflectL P P' A B -> Col A B M -> Col P M P' ->
ReflectL_at M P P' A B.