∀ {α : Sort u_1} {β : Sort u_2} {γ : Sort u_3} {δ : Sort u_4} {f : α → γ} {g : β → δ},
  Function.Injective f →
    Function.Injective g → ∀ (r : α → β → Prop) (a : α) (b : β), Relation.Map r f g (f a) (g b) = r a b