∀ {τ : Type u_1} [inst : AddMonoid τ] [inst_1 : TopologicalSpace τ] [inst_2 : ContinuousAdd τ] {α : Type u_2}
  [inst_3 : TopologicalSpace α] (ϕ : Flow τ α) (t₁ t₂ : τ) (x : α), ϕ.toFun t₁ (ϕ.toFun t₂ x) = ϕ.toFun (t₁ + t₂) x