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On the derivative of the associated Legendre function of the first kind of integer order with respect to its degree (with applications to the construction of the associated Legendre function of the second kind of integer degree and order). (English) Zbl 1304.33006
Summary: In our recent works, we have investigated the derivative of the Legendre function of the first kind, $P _{\nu }(z)$, with respect to its degree $\nu $. In the present work, we extend these studies and construct several representations of the derivative of the associated Legendre function of the first kind, ${P_{\nu}^{\pm m}(z)}$, with respect to the degree $\nu $, for ${m \in \mathbb{N}}$. At first, we establish several contour-integral representations of ${\partial P_{\nu}^{\pm m}(z)/\partial\nu}$. They are then used to derive Rodrigues-type formulas for ${[\partial P_{\nu}^{\pm m}(z)/\partial\nu]_{\nu=n}}$ with ${n \in \mathbb{N}}$. Next, some closed-form expressions for ${[\partial P_{\nu}^{\pm m}(z)/\partial\nu]_{\nu=n}}$ are obtained. These results are applied to find several representations, both explicit and of the Rodrigues type, for the associated Legendre function of the second kind of integer degree and order, ${Q_{n}^{\pm m}(z)}$; the explicit representations are suitable for use for numerical purposes in various regions of the complex $z$-plane. Finally, the derivatives ${[\partial^{2}P_{\nu}^{m}(z)/\partial\nu^{2}]_{\nu=n}, [\partial Q_{\nu}^{m}(z)/\partial\nu]_{\nu=n}}$ and ${[\partial Q_{\nu}^{m}(z)/\partial\nu]_{\nu=-n-1}}$, all with $m > n$, are evaluated in terms of ${[\partial P_{\nu}^{-m}(\pm z)/\partial\nu]_{\nu=n}}$. The present paper is a complementary to a recent one from the author [ibid. 46, No. 1, 231--260 (2009; Zbl 1304.33005)], in which the derivative ${\partial P_{n}^{\mu}(z)/\partial\mu}$ has been investigated.

MSC:
33C45Orthogonal polynomials and functions of hypergeometric type
33C05Classical hypergeometric functions, ${}_2F_1$
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References:
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