Sharp Landen transformation inequalities for hypergeometric functions, with applications
Sharp Landen transformation inequalities for hypergeometric functions, with applications
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超几何函数的 Sharp Landen 变换不等式及其应用
DOI:
10.1016/j.jmaa.2019.02.018
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发表时间:
2019-06
期刊:
影响因子:
--
通讯作者:
Yu-Ming Chu
中科院分区:
文献类型:
--
作者:
Song-Liang Qiu;Xiao-Yan Ma;Yu-Ming Chu
The authors present sharp Landen transformation inequalities for the hypergeometric functions F 1 2 (a, b; a+ b; x) and F 1 2 (a, b;(a+ b+ 1)/2; x), by showing the monotonicity properties of certain combinations defined in terms of one of these two hypergeometric functions and linear (or rational) functions, thus giving complete solutions of the problem on extending the well-known Landen transformation identities for the complete elliptic integrals of the first kind to these two hypergeometric functions, and substantially improving the related known results. As applications of these results, sharp Landen transformation inequalities are obtained for the generalized Grötzsch ring functions and the modular functions, which appear in Ramanujan's modular equations. Some other properties of hypergeometric functions and several properties of the Ramanujan constant are obtained, too.
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