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 InCircCenter: forall U V W, V<>W -> InCirc U (U, V, W).
Global Instance Euclid_neutral_ruler_compass_follows_from_Tarski_ruler_and_compass :
euclidean_neutral_ruler_compass Euclid_neutral_follows_from_Tarski_neutral.