no goals
ι : Type ?u.228338
ι' : Type ?u.228341
α : Type u_1
β : Type u_2
γ : Type ?u.228350
inst✝ : LinearOrderedField α
l : Filter β
f : β → α
r : α
hr : r < 0
⊢ Tendsto (fun x => r * f x) l atTop ↔ Tendsto f l atBot
simpa only [neg_mul, tendsto_neg_atBot_iff] using tendsto_const_mul_atBot_of_pos (neg_pos.2 hr)