∀ {α : Type u_1} [inst : DivisionMonoid α] (x x_1 : Filter α),
  Filter.map Inv.inv (Filter.map₂ (fun x1 x2 => x1 * x2) x x_1) =
    Filter.map₂ (fun x1 x2 => x1 * x2) (Filter.map Inv.inv x_1) (Filter.map Inv.inv x)