チェビシェフ多項式のロドリゲス公式

(1)

\[ T_{n}(x)=\frac{(-1)^{n}\sqrt{\pi}\sqrt{1-x^{2}}}{2^{n}\Gamma\left(n+\frac{1}{2}\right)}\frac{d^{n}}{dx^{n}}\left(1-x^{2}\right)^{n-\frac{1}{2}} \]

(2)

\[ U_{n}(x)=\frac{(-1)^{n}\sqrt{\pi}(n+1)}{2^{n+1}\Gamma\left(n+\frac{3}{2}\right)\sqrt{1-x^{2}}}\frac{d^{n}}{dx^{n}}\left(1-x^{2}\right)^{n+\frac{1}{2}} \]

• チェビシェフ多項式の別表記
  \[ T_{n}(x)=\frac{1}{2}\left(\left(x+i\sqrt{1-x^{2}}\right)^{n}+\left(x-i\sqrt{1-x^{2}}\right)^{n}\right) \]