no goals
ι : Type u_2
κ : Type ?u.10143
R : Type ?u.10146
α : Type u_1
inst✝² : DivisionSemiring α
inst✝¹ : TopologicalSpace α
inst✝ : TopologicalSemiring α
f g : ι → α
a a₁ a₂ : α
h : a₂ ≠ 0
H : HasSum (fun i => f i * a₂) (a₁ * a₂)
⊢ HasSum f a₁
simpa only [mul_inv_cancel_right₀ h] using H.mul_right a₂⁻¹