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_is_image_spec : forall P P' A B, A<>B -> (Reflect P' P A B <-> ReflectL P' P A B).