∀ {𝕜 : Type u_4} [inst : Field 𝕜] [inst_1 : LinearOrder 𝕜] [IsStrictOrderedRing 𝕜] [Archimedean 𝕜]
  [inst_4 : TopologicalSpace 𝕜] [OrderTopology 𝕜] {r : 𝕜},
  Filter.Tendsto (fun n => r ^ n) Filter.atTop (nhds 0) ↔ |r| < 1