巾関数の積分表現
巾関数の積分表現
\[ \frac{1}{z^{\alpha}}=\frac{1}{\Gamma\left(\alpha\right)}\int_{0}^{\infty}t^{\alpha-1}e^{-zt}dt \]
\[ \frac{1}{z^{\alpha}}=\frac{1}{\Gamma\left(\alpha\right)}\int_{0}^{\infty}t^{\alpha-1}e^{-zt}dt \]
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\(\Gamma\left(z\right)\)はガンマ関数\begin{align*}
\frac{1}{z^{\alpha}} & =\frac{1}{\Gamma\left(\alpha\right)}\frac{\Gamma\left(\alpha\right)}{z^{\alpha}}\\
& =\frac{1}{\Gamma\left(\alpha\right)}\mathcal{L}_{t}\left[H\left(t\right)t^{\alpha-1}\right]\left(z\right)\\
& =\frac{1}{\Gamma\left(\alpha\right)}\int_{-\infty}^{\infty}H\left(t\right)t^{\alpha-1}e^{-zt}dt\\
& =\frac{1}{\Gamma\left(\alpha\right)}\int_{0}^{\infty}t^{\alpha-1}e^{-zt}dt
\end{align*}
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母関数の逆演算
\[
a_{n}=\frac{1}{n!}\left[\frac{d^{n}}{dz^{n}}G\left(z\right)\right]_{z=0}
\]
畳み込みの定義
\[
\left(f*g\right)\left(x\right)=\int f\left(t\right)g\left(x-t\right)dt
\]
畳み込みの性質
\[
\mathcal{F}\left(\left(f*g\right)\left(x\right)\right)=\mathcal{F}\left(\left(f\right)\left(x\right)\right)\mathcal{F}\left(\left(g\right)\left(x\right)\right)
\]
単位分数とエジプト式分数の定義
\[
\frac{1}{2},\frac{1}{3},\frac{1}{4}
\]