End circle_continuity.
Section Neutral.
Context `{TnEQD:Tarski_neutral_dimensionless_with_decidable_point_equality}.
Global Instance Euclid_neutral_follows_from_Tarski_neutral : euclidean_neutral.

Lemma OnCirc_OnCirc : forall A P Q R, Q<>R -> OnCirc A (P,Q,R) -> euclidean_axioms.OnCirc A (P,Q,R).