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Summierung einer nach den Hermiteschen Polynomen des Kreises fortschreitenden Reihe. - MaRDI portal

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Summierung einer nach den Hermiteschen Polynomen des Kreises fortschreitenden Reihe. (Q2586599)

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Summierung einer nach den Hermiteschen Polynomen des Kreises fortschreitenden Reihe.
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    Summierung einer nach den Hermiteschen Polynomen des Kreises fortschreitenden Reihe. (English)
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    1940
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    Beweis der Reihensummierung \[ \begin{gathered} \sum_{n=0}^{\infty} \dfrac{s^n}{n!} \sum_{l+m=n} l!m!U_{lm}(x,y)V_{lm}(\xi,\eta)\\ = \{[1-2s(x\xi+y\eta)+s^2]^2 -4s^2(1-x^2-y^2)(1-\xi^2-\eta^2]\}^{-\tfrac12}, \end{gathered} \] wo \(U_{lm}(x,y)\) und \(V_{lm}(x,y)\) die durch \[ [(1-sx-ty)^2+(s^2+t^2)(1-x^2-y^2)]^{-\tfrac12}=\sum_{l,m=0}^{\infty} s^lt^mU_{lm}(x,y) \] und \[ (1-2sx-2ty+s^2+t^2)^{-1} = \sum_{l,m=0}^{\infty} s^lt^mV_{lm}(x,y) \] erzeugten Hermiteschen Polynome des Einheitskreises bedeuten.
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