Mathematical Inequalities & Applications · Volume 23, Issue 2 Characterization of inner product spaces and quadratic functions by some classes of functions 23-35 Pages 439-445 DOI 10.7153/mia-2020-23-35 Downloads Short PDF Full PDF PNG Authors Mirosław Adamek Keywords inner product space quadratic function c-quadratic-midaffine function F-midaffine function Subject classes 46C15 26B25 39B62