Require Export GeoCoq.Tarski_dev.Ch13_6_Desargues_Hessenberg.
Section T14_sum.
Context `{T2D:Tarski_2D}.
Context `{TE:@Tarski_euclidean Tn TnEQD}.

Lemma sum_to_sump : forall O E E' A B C, Sum O E E' A B C -> Sump O E E' A B C.