Hint Immediate col_trivial_1 col_trivial_2 col_trivial_3: col.
Section T4_4.
Context `{TnEQD:Tarski_neutral_dimensionless_with_decidable_point_equality}.

Lemma not_col_distincts : forall A B C ,
~ Col A B C ->
~ Col A B C /\ A <> B /\ B <> C /\ A <> C.