It is wellknown that the pth power mean function of two positive real number a and b is defined as Mp(a,b)=((ap+bp)/2)1/p,p≠0 while Mp(a,b)=〖KF(〗ab,〖KF)〗p=0. This paper proves that power mean function Mp(a,b) is convex for parameter p≤0, that furthermore, power mean function Mp(a,b) is logconvex for parameter p≤0 and is logconcave for parameter p≥0 respectively.
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官 春 梅.关于p次幂平均函数对数凸性的探讨[J].重庆工商大学学报(自然科学版),2016,33(1):23-25 GUAN Chunmei. Discussion on Logarithm Convexity of pth Power Mean Function[J]. Journal of Chongqing Technology and Business University(Natural Science Edition),2016,33(1):23-25