Some inequalities for characteristic functions. II

Recently we established Matysiak and Szablowski’s conjecture [V. Matysiak, P.J. Szablowski, Theory Probab. Appl. 45 (2001) 711–713] about a lower bound of real-valued characteristic functions. In this paper, applying an alternative approach we are able to give explicitly the ranges of argument for which the obtained inequalities hold true for general characteristic functions. © 2006 Elsevier Inc. All rights reserved