Require Export GeoCoq.Tarski_dev.Ch04_col.
Section Equivalence_between_decidability_properties_of_basic_relations.
Context `{Tn:Tarski_neutral_dimensionless}.

Lemma eq_dec_implies_l4_17 :
(forall A B:Tpoint, A=B \/ A<>B) ->
forall A B C P Q,
A<>B -> Col A B C -> Cong A P A Q -> Cong B P B Q -> Cong C P C Q.