∀ {α : Type u_1} [inst : TopologicalSpace α] [inst_1 : CommGroup α] [inst_2 : LinearOrder α] [IsOrderedMonoid α]
  [OrderTopology α] (a : α), nhds a = ⨅ r, ⨅ (_ : r > 1), Filter.principal {b | |a / b|ₘ < r}