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On discrete Favard’s and Berwald’s inequalities. (English) Zbl 1263.26008

Summary: We obtain an extensions of majorization type results and extensions of weighted Favard’s and Berwald’s inequality. We prove positive semi-definiteness of matrices generated by differences deduced from majorization type results and differences deduced from weighted Favard’s and Berwald’s inequality. This implies a surprising property of exponentially convexity and \(\log\)-convexity of this differences which allows us to deduce Lyapunov’s inequalities for the differences, which are improvements of majorization type results and weighted Favard’s and Berwald’s inequalities. Analogous Cauchy’s type means, as equivalent forms of exponentially convexity and log-convexity, are also studied and the monotonicity properties are proved.

MSC:

26A24 Differentiation (real functions of one variable): general theory, generalized derivatives, mean value theorems
26A51 Convexity of real functions in one variable, generalizations
26D15 Inequalities for sums, series and integrals