prove-that-n-1-1-n-ln-1-1-n-2-show-that-k-2-1-k-k-k-

Question Number 29980 by abdo imad last updated on 14/Feb/18

p r o v e t h a t γ = \sum_{n = 1}^{\infty} (\frac{1}{n} - l n (1 + \frac{1}{n}))

2) s h o w t h a t γ = \sum_{k = 2}^{\infty} \frac{{(- 1)}^{k}}{k} ξ (k) .