How Can the Hermite Polynomial Identity Be Proven?

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SUMMARY

The forum discussion centers on proving the identity involving Hermite polynomials: \(\Sigma_{k=0}^{n}\left(\stackrel{n}{k}\right) H_{k}(x)H_{n-k}(y)=2^{n/2}H_{n}(2^{-1/2}(x+y))\). Users suggest using mathematical induction on \(n\) as a viable method for the proof. The identity connects the summation of products of Hermite polynomials to a scaled Hermite polynomial evaluated at the sum of its arguments. This relationship is crucial for understanding the properties of Hermite polynomials in mathematical analysis.

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appelberry
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Does anyone know how to prove the following identity:

\Sigma_{k=0}^{n}\left(\stackrel{n}{k}\right) H_{k}(x)H_{n-k}(y)=2^{n/2}H_{n}(2^{-1/2}(x+y))

where H_{i}(z)represents the Hermite polynomial?
 
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I would try induction on n.
 

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