Jiaozuo Teacher's College, Jiaozuo city, Henan 454150, PR China, Zhengzhou university, Daxue Road 75, zhengzhou city, Henan 450052, PR China. E-mail: sunjianshe@126.com
(Communicated by Sever S. Dragomir)
In this paper, the open problem published in (Feng Qi, An algebraic inequality, J. Inequal. Pure Appl. Math., 2 (1), Art. 13, 2001) is solved by using analytic arguments. At the same time, the precise scope of r in the open problem is given. The lower bound of the Theorem is refined.
Algebraic inequality, monotonicity, differentiable complex function
