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let-put-H-n-k-1-k-n-1-k-prove-that-n-1-H-n-n-2-2-3-




Question Number 26573 by abdo imad last updated on 26/Dec/17
let put  H_n = Σ_(k=1) ^(k=n)   (1/k)      prove that   Σ_(n=1) ^∝  (H_n /n^2 )  =  2ξ(3)
letputHn=k=1k=n1kprovethatn=1Hnn2=2ξ(3)

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