摘要 : <abstract_text><p>In this paper we characterize the set of points where the lateral derivatives of the Takagi-Van der Waerden functions are infinite. We also prove that the set of points with infinite derivative has Ha... 展开 <abstract_text><p>In this paper we characterize the set of points where the lateral derivatives of the Takagi-Van der Waerden functions are infinite. We also prove that the set of points with infinite derivative has Hausdorff dimension one and Lebesgue measure zero. (C) 2019 Elsevier Inc. All rights reserved.</p></abstract_text> 收起