$\Gamma(p)$の性質
\[\begin{eqnarray}\Gamma(1)&=&\int^{\infty}_{t=0}e^{-t}dt\\&=&[-e^{-t}]^{\infty}_{t=0}\\&=&1\end{eqnarray}\]
参照：
$\Gamma(p)$関数
$e^{x}$の微分
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