∀ {τ : Type u_2} [inst : AddMonoid τ] [inst_1 : TopologicalSpace τ] [inst_2 : ContinuousAdd τ] {α : Type u_1}
  [inst_3 : TopologicalSpace α] (ϕ : Flow τ α) {s : Set α}, IsInvariant ϕ.toFun s → ∀ (x : τ × ↑s), ϕ.toFun x.1 ↑x.2 ∈ s