∀ {α : Type u_1} {β : Type u_2} [inst : Ring α] [inst_1 : PartialOrder α] [IsOrderedRing α] {l : Filter β}
  {f g : β → α},
  Filter.Tendsto f l Filter.atTop → Filter.Tendsto g l Filter.atBot → Filter.Tendsto (fun x => f x * g x) l Filter.atBot