Instance Hilbert_neutral_follows_from_Tarski_neutral : Hilbert_neutral_dimensionless.Instance Hilbert_2D_follows_from_Tarski_2D : Hilbert_neutral_2D Hilbert_neutral_follows_from_Tarski_neutral.

Lemma lower_dim_3' : {A : Tpoint & {B : Tpoint & {C : Tpoint & {D | ~ exists p, IncidentP A p /\ IncidentP B p /\ IncidentP C p /\ IncidentP D p}}}}.