End Beeson_1.
Section Beeson_2.
Context `{Tn:Tarski_neutral_dimensionless}.
Variable Bet_stability : forall A B C, ~ ~ Bet A B C -> Bet A B C.

(* Specifications: *)
Lemma bet_dec_eq_dec_b :
(forall A B:Tpoint, ~ A <> B -> A = B).
Lemma BetSEq : forall A B C, BetS A B C <-> Bet A B C /\ A <> B /\ A <> C /\ B <> C.
End Beeson_2.