α : Type u_2
R : Type u_1
inst✝¹ : LinearOrderedField R
inst✝ : Archimedean R
f : α → ℚ
l : Filter α
⊢ Tendsto (fun n => ↑(f n)) l atBot ↔ Tendsto (Rat.cast ∘ f) l atBot
α : Type u_2
R : Type u_1
inst✝¹ : LinearOrderedField R
inst✝ : Archimedean R
f : α → ℚ
l : Filter α
⊢ Tendsto (fun n => ↑(f n)) l atBot ↔ Tendsto f l atBot
rw [← @Rat.comap_cast_atBot R, tendsto_comap_iff]
no goals
α : Type u_2
R : Type u_1
inst✝¹ : LinearOrderedField R
inst✝ : Archimedean R
f : α → ℚ
l : Filter α
⊢ Tendsto (fun n => ↑(f n)) l atBot ↔ Tendsto (Rat.cast ∘ f) l atBot
rfl