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How can I prove that

$$\int_0^{\infty} \mathrm{e}^{-x}\log(x)dx=-\gamma$$

vito
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  • What is your definition of $\gamma$? Or, tell us something you know about $\gamma$. – mickep Mar 29 '17 at 11:35
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    http://math.stackexchange.com/questions/112304/showing-that-gamma-int-0-infty-e-t-log-t-dt-where-gamma-is-t – Zubzub Mar 29 '17 at 11:39

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