Formula:6498

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Digital Library of Mathematical Functions ID 18.18.E11

( a 1 2 + + a r 2 ) 1 2 n n ! H n ( a 1 x 1 + + a r x r ( a 1 2 + + a r 2 ) 1 2 ) = m 1 + + m r = n a 1 m 1 a r m r m 1 ! m r ! H m 1 ( x 1 ) H m r ( x r ) . superscript superscript subscript 𝑎 1 2 superscript subscript 𝑎 𝑟 2 1 2 𝑛 𝑛 Hermite-polynomial-H 𝑛 subscript 𝑎 1 subscript 𝑥 1 subscript 𝑎 𝑟 subscript 𝑥 𝑟 superscript superscript subscript 𝑎 1 2 superscript subscript 𝑎 𝑟 2 1 2 subscript subscript 𝑚 1 subscript 𝑚 𝑟 𝑛 superscript subscript 𝑎 1 subscript 𝑚 1 superscript subscript 𝑎 𝑟 subscript 𝑚 𝑟 subscript 𝑚 1 subscript 𝑚 𝑟 Hermite-polynomial-H subscript 𝑚 1 subscript 𝑥 1 Hermite-polynomial-H subscript 𝑚 𝑟 subscript 𝑥 𝑟 {\displaystyle{\displaystyle\frac{(a_{1}^{2}+\dots+a_{r}^{2})^{\frac{1}{2}n}}{% n!}H_{n}\left(\frac{a_{1}x_{1}+\cdots+a_{r}x_{r}}{(a_{1}^{2}+\cdots+a_{r}^{2})% ^{\frac{1}{2}}}\right)=\sum_{m_{1}+\cdots+m_{r}=n}\frac{a_{1}^{m_{1}}\cdots a_% {r}^{m_{r}}}{m_{1}!\cdots m_{r}!}H_{m_{1}}\left(x_{1}\right)\cdots H_{m_{r}}% \left(x_{r}\right).}}


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