fact: Definition extend_point {Γ A1 A2} (γ : ⟬Γ⟭) (a1:A1) (a2:A2) : ⟬extends Γ A1 A2⟭.
imports: Coq(ssreflect ssrfun ssrbool) Coq(Relation_Definitions Morphisms) Mon(SPropBase) Relational(Category RelativeMonads EnrichedSetting)