∀ {ι : Type u_1} {N : Type u_4} [inst : TopologicalSpace N] [inst_1 : Monoid N] [inst_2 : ContinuousMul N]
  [inst_3 : T2Space N] {f : ι → Nˣ} {r₁ r₂ : N} {l : Filter ι} [inst_4 : l.NeBot]
  (h₁ : Filter.Tendsto (fun x => ↑(f x)) l (nhds r₁)) (h₂ : Filter.Tendsto (fun x => ↑(f x)⁻¹) l (nhds r₂)),
  ↑(h₁.units h₂)⁻¹ = r₂