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_id : forall A B T T',
A<>B ->
Col A B T ->
Reflect T T' A B ->
T = T'.