Mathematics – Classical Analysis and ODEs

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2009-10-23

Mathematics

Classical Analysis and ODEs

LaTeX, 10 pages

Scientific paper

A relationship between partial derivatives of the associated Legendre function of the first kind with respect to its degree, $[\partial P_{\nu}^{m}(z)/\partial\nu]_{\nu=n}$, and to its order, $[\partial P_{n}^{\mu}(z)/\partial\mu]_{\mu=m}$, is established for $m,n\in\mathbb{N}$. This relationship is used to deduce four new closed-form representations of $[\partial P_{\nu}^{m}(z)/\partial\nu]_{\nu=n}$ from those found recently for $[\partial P_{n}^{\mu}(z)/\partial\mu]_{\mu=m}$ by the present author [R. Szmytkowski, J. Math. Chem. 46 (2009) 231]. Several new expressions for the associated Legendre function of the second kind of integer degree and order, $Q_{n}^{m}(z)$, suitable for numerical purposes, are also derived.

**Szmytkowski Radoslaw**

Physics – Atomic Physics

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