Global Instance IncidLP_morphisml : Proper(EqL ==> eq ==> iff) IncidLP.Global Instance IncidLP_morphismr : Proper(eq ==> EqP ==> iff) IncidLP.

Lemma bet_cong3_bet : forall A B C A' B' C', A' <> B' -> B' <> C' -> A' <> C' -> BetH A B C -> ColH A' B' C' -> CongH A B A' B' -> CongH B C B' C' -> CongH A C A' C' -> BetH A' B' C'.