Mathematical Inequalities & Applications · Volume 26, Issue 4 Old and new on the 3-convex functions 26-56 Pages 911-933 DOI 10.7153/mia-2023-26-56 Downloads Short PDF Full PDF PNG Authors Dan Ş. Marinescu Constantin P. Niculescu Keywords higher order convexity function with positive differences spectral decomposition of real symmetric matrices Subject classes 26A51 39B62 26D15 15A20