Let f be a function in the Zygmund class in the euclidean space. It is proved that the Hausdorff dimension of the set of points where f has bounded divided differences, is bigger or equal to one. Furthermore, if f is in the Small Zygmund class, then the Hausdorff dimension of the set of points where f is differentiable, is bigger or equal to one. The sharpness of these results is also discussed. © 2013 London Mathematical Society.
|Journal||Proceedings of the London Mathematical Society|
|Publication status||Published - 1 Jan 2014|