Displaying similar documents to “Continuously differentiable means.”

Optimal sublinear inequalities involving geometric and power means

Jiajin Wen, Sui-Sun Cheng, Chaobang Gao (2009)

Mathematica Bohemica

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There are many relations involving the geometric means G n ( x ) and power means [ A n ( x γ ) ] 1 / γ for positive n -vectors x . Some of them assume the form of inequalities involving parameters. There then is the question of sharpness, which is quite difficult in general. In this paper we are concerned with inequalities of the form ( 1 - λ ) G n γ ( x ) + λ A n γ ( x ) ≥ A n ( x γ ) and ( 1 - λ ) G n γ ( x ) + λ A n γ ( x ) ≤ A n ( x γ ) with parameters λ ∈ ℝ and γ ∈ ( 0 , 1 ) . We obtain a necessary and sufficient condition for the former inequality, and a sharp condition for the latter. Several applications of our results are...