AM(s)-Convex function and its Jensen-type inequality
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摘要: 针对函数的凸性及其广义凸性,研究凸函数的推广问题.首先引入了n个正数的加权r次幂s-平均的概念和记号,并利用加权r次幂s-平均定义了AM(s)-凸函数;然后用符号化的方式讨论了AM(s)-凸函数的判定定理和运算性质;最后,证明了AM(s)-凸函数的Jensen型不等式,并给出了其等价形式.研究结果表明,AM(s)-凸函数是包含众多凸函数的一类广义凸函数,运用加权r次幂s-平均定义和研究AM(s)-凸函数是对凸函数进行推广和研究的有效方法,同时也为凸函数的拓展推广和深入研究探索了一条新的途径.
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关键词:
- 加权r次幂s-平均 /
- AM(s)-凸函数 /
- 判定定理 /
- 运算性质 /
- Jensen型不等式
Abstract: Based on the convexity and general convexity of a function, the authors study extending issues of a convex function. Firstly, the concept and sign of weighted r-th power s-mean of n positives are introduced; secondly, the AM(s)-convex function is defined by weighted r-th power s-mean; thirdly, the judgment theorem and operation properties of AM(s)-convex function are discussed; and finally, the Jensen-type inequality of the AM(s)-convex function is proved and an equivalent form is provided. The study shows that the AM(s)-convex function is a subset of general convex functions that includes many convex functions. Studying the AM(s)-convex function with the method of weighted r-th power s-mean is an effective way of extending and studying convex functions. This method explores a new approach to extending and studying convex functions. -
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