Section Tarski_to_intuitionistic_Tarski.
Context `{TnEQD:Tarski_neutral_dimensionless_with_decidable_point_equality}.

(* Specifications: *)
Lemma cong_stability : forall A B C D, ~ ~ Cong A B C D -> Cong A B C D.
Definition BetH A B C : Prop := Bet A B C /\ A <> B /\ B <> C.
Lemma bet_stability : forall A B C, ~ ~ BetH A B C -> BetH A B C.
Definition T A B C : Prop := ~ (A<>B /\ B<>C /\ ~ BetH A B C).