Abstract:
Generalizations of the classical inequality |f(x)−f(y)|2⩽2f(0){f(0)−Ref(x−y)} for a positive-definite complex-valued function f on an Abelian group are obtained.
Keywords:
positive-definite function on an Abelian group, Bochner's theorem.
This publication is cited in the following 3 articles:
V. P. Zastavnyi, “Inequalities for Positive Definite Functions”, Math. Notes, 108:6 (2020), 791–801
A. B. Pevnyi, S. M. Sitnik, “Obobscheniya neravenstv M. G. Kreina, E. A. Gorina i Yu. V. Linnika dlya polozhitelno opredelennykh funktsii na mnogotochechnyi sluchai”, Sib. elektron. matem. izv., 16 (2019), 263–270
Yu. A. Brudnyi, M. G. Zaidenberg, A. L. Koldobskii, V. Ya. Lin, B. S. Mityagin, S. Norvidas, E. M. Semenov, P. V. Semenov, “Evgenii Alekseevich Gorin (obituary)”, Russian Math. Surveys, 74:5 (2019), 935–946