Report - Octogon Mathematical Magazine, Vol. 23, No.1, April 2015 … · 2016-05-29 · x,y∈ R for which 2 n k=1 z x+y 2 k − n k=1 w x+y 2 k ≤ n k=1 zx k −w y k + n k=1 zy k −w x

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