End T11_1.
Section T11_2.
Context `{TnEQD:Tarski_neutral_dimensionless_with_decidable_point_equality}.

Lemma lta_distincts : forall A B C D E F, LtA A B C D E F ->
A<>B /\ C<>B /\ D<>E /\ F<>E /\ D <> F.