Section Suma_1.
Context `{TnEQD:Tarski_neutral_dimensionless_with_decidable_point_equality}.

Lemma suma_distincts : forall A B C D E F G H I, SumA A B C D E F G H I ->
A<>B /\ B<>C /\ D<>E /\ E<>F /\ G<>H /\ H<>I.