refine tendsto_iff_forall_eventually_mem.mpr ?_
f : ℝ → ℝ
a x : ℝ
f_mono : StrictMono f
f_iso : Isometry f
⊢ Tendsto (fun y => f y + a) (𝓝[>] x) (𝓝[>] (f x + a))
f : ℝ → ℝ
a x : ℝ
f_mono : StrictMono f
f_iso : Isometry f
⊢ ∀ s ∈ 𝓝[>] (f x + a), ∀ᶠ (x : ℝ) in 𝓝[>] x, f x + a ∈ s