fact: Definition weak_inverse_projection_postulate := forall A B C D E F P Q, Acute A B C -> Per D E F -> SumA A B C A B C D E F -> Out B A P -> P <> Q -> Per B P Q -> Coplanar A B C Q -> exists Y, Out B C Y /\ Col P Q Y.
imports: GeoCoq.Tarski_dev.Definitions