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- W2056545619 abstract "Polynomial sequence {Pm}m≥0 is q-logarithmically concave if Pm2−Pm+1Pm−1 is a polynomial with nonnegative coefficients for any m≥1. We introduce an analogue of this notion for formal power series whose coefficients are nonnegative continuous functions of a parameter. Four types of such power series are considered where the parameter dependence is expressed by a ratio of gamma functions. We prove six theorems stating various forms of q-logarithmic concavity and convexity of these series. The main motivating examples for these investigations are hypergeometric functions. In the last section of the paper we present new inequalities for the Kummer function, the ratio of the Gauss functions and the generalized hypergeometric function obtained as direct applications of the general theorems." @default.
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- W2056545619 date "2013-10-01" @default.
- W2056545619 modified "2023-09-26" @default.
- W2056545619 title "Log-convexity and log-concavity for series in gamma ratios and applications" @default.
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- W2056545619 doi "https://doi.org/10.1016/j.jmaa.2013.04.061" @default.
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