Mathematical Inequalities & Applications · Volume 17, Issue 2 Digital sum inequalities and approximate convexity of Takagi-type functions 17-50 Pages 679-691 DOI 10.7153/mia-17-50 Downloads Short PDF Full PDF PNG Authors Pieter C. Allaart Keywords digital sum cumulative digital sum Takagi function approximate convexity Subject classes 11A63 26A27 26A51