4.5 Article

Optimal Lehmer Mean Bounds for the Toader Mean

Journal

RESULTS IN MATHEMATICS
Volume 61, Issue 3-4, Pages 223-229

Publisher

BIRKHAUSER VERLAG AG
DOI: 10.1007/s00025-010-0090-9

Keywords

Lehmer mean; Toader mean; power mean

Funding

  1. National Natural Science Foundation of China [11071069]
  2. Natural Science Foundation of Zhejiang Province [Y7080106]
  3. Innovation Team Foundation of the Department of Education of Zhejiang Province [T200924]

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We find the greatest value p and least value q such that the double inequality L (p) (a, b) < T(a, b) < L (q) (a, b) holds for all a, b > 0 with a not equal b, and give a new upper bound for the complete elliptic integral of the second kind. Here and L (p) (a, b) = (a (p+1) + b (p+1))/(a (p) + b (p) ) denote the Toader and p-th Lehmer means of two positive numbers a and b, respectively.

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