∀ {𝕜 : Type u_1} {α : Type u_2} [inst : Field 𝕜] [inst_1 : LinearOrder 𝕜] [IsStrictOrderedRing 𝕜]
  [inst_3 : TopologicalSpace 𝕜] [OrderTopology 𝕜] {l : Filter α} {f g : α → 𝕜} {C : 𝕜},
  0 < C →
    Filter.Tendsto f l (nhds C) → Filter.Tendsto g l Filter.atBot → Filter.Tendsto (fun x => f x * g x) l Filter.atBot