Section Tarski_to_intuitionistic_Tarski.
Context `{TnEQD:Tarski_neutral_dimensionless_with_decidable_point_equality}.
Definition BetH A B C : Prop := Bet A B C /\ A <> B /\ B <> C.
Definition T A B C : Prop := ~ (A<>B /\ B<>C /\ ~ BetH A B C).
Definition ColB A B C := ~ (~ T C A B /\ ~ T A C B /\ ~ T A B C).

Lemma T_dec : forall A B C, T A B C \/ ~ T A B C.