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_is_image_spec :
forall M A B P P',
ReflectL_at M P P' A B -> ReflectL P P' A B.