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_in_gen_is_image : forall M A B P P',
Reflect_at M P P' A B  -> Reflect P P' A B.