王文和杨世图(2014)采用通常的手段, 即利用Schur - $m$ 指数凸函 数判定定理研究了一类对称函数的Schur -$m$ 指数凸性. 文章修正了王文和杨世图(2014)中的主要定理的条件,并且利用Schur - $m$ 指数凸函数的一个已知性质,非常简洁地证明了这个定理.

Using the usual means, that is, by the judgment theorem for Schur - $m$ exponent of convex function, Schur $m$-power convexity for a class of symmetric functions is studied by Wang and Yang (2014). In this note, the condition of main theorem in Wang and Yang (2014) is corrected, and by a known property of Schur $m$-power convex functions, this theorem is very simply proved.