∀ {H : Type x} [inst : TopologicalSpace H] [inst_1 : AddCommGroup H] [inst_2 : PartialOrder H] [IsOrderedAddMonoid H]
  [ContinuousNeg H] {a : H}, Filter.Tendsto Neg.neg (nhdsWithin (-a) (Set.Iio (-a))) (nhdsWithin a (Set.Ioi a))