# regular solutions

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##### 1: 33.23 Methods of Computation
The power-series expansions of §§33.6 and 33.19 converge for all finite values of the radii $\rho$ and $r$, respectively, and may be used to compute the regular and irregular solutions. … Thus the regular solutions can be computed from the power-series expansions (§§33.6, 33.19) for small values of the radii and then integrated in the direction of increasing values of the radii. … This implies decreasing $\ell$ for the regular solutions and increasing $\ell$ for the irregular solutions of §§33.2(iii) and 33.14(iii). …
##### 2: 33.2 Definitions and Basic Properties
###### §33.2(iii) Irregular Solutions$G_{\ell}\left(\eta,\rho\right),{H^{\pm}_{\ell}}\left(\eta,\rho\right)$
As in the case of $F_{\ell}\left(\eta,\rho\right)$, the solutions ${H^{\pm}_{\ell}}\left(\eta,\rho\right)$ and $G_{\ell}\left(\eta,\rho\right)$ are analytic functions of $\rho$ when $0<\rho<\infty$. …
##### 5: 16.21 Differential Equation
16.21.1 $\left((-1)^{p-m-n}z(\vartheta-a_{1}+1)\cdots(\vartheta-a_{p}+1)-(\vartheta-b_{% 1})\cdots(\vartheta-b_{q})\right)w=0,$
With the classification of §16.8(i), when $p the only singularities of (16.21.1) are a regular singularity at $z=0$ and an irregular singularity at $z=\infty$. When $p=q$ the only singularities of (16.21.1) are regular singularities at $z=0$, $(-1)^{p-m-n}$, and $\infty$. A fundamental set of solutions of (16.21.1) is given by …
##### 6: 2.6 Distributional Methods
###### §2.6(iv) Regularization
However, in the theory of generalized functions (distributions), there is a method, known as “regularization”, by which these integrals can be interpreted in a meaningful manner. …For rigorous derivations of these results and also order estimates for $\delta_{n}(x)$, see Wong (1979) and Wong (1989, Chapter 6).
##### 7: 33.22 Particle Scattering and Atomic and Molecular Spectra
For scattering problems, the interior solution is then matched to a linear combination of a pair of Coulomb functions, $F_{\ell}\left(\eta,\rho\right)$ and $G_{\ell}\left(\eta,\rho\right)$, or $f\left(\epsilon,\ell;r\right)$ and $h\left(\epsilon,\ell;r\right)$, to determine the scattering $S$-matrix and also the correct normalization of the interior wave solutions; see Bloch et al. (1951). …
##### 8: 14.2 Differential Equations
###### §14.2(iii) Numerically Satisfactory Solutions
Equation (14.2.2) has regular singularities at $x=1$, $-1$, and $\infty$, with exponent pairs $\left\{-\frac{1}{2}\mu,\frac{1}{2}\mu\right\}$, $\left\{-\frac{1}{2}\mu,\frac{1}{2}\mu\right\}$, and $\left\{\nu+1,-\nu\right\}$, respectively; compare §2.7(i). … Hence they comprise a numerically satisfactory pair of solutions2.7(iv)) of (14.2.2) in the interval $-1. …
##### 9: Bibliography B
• W. G. C. Boyd and T. M. Dunster (1986) Uniform asymptotic solutions of a class of second-order linear differential equations having a turning point and a regular singularity, with an application to Legendre functions. SIAM J. Math. Anal. 17 (2), pp. 422–450.
• ##### 10: 15.11 Riemann’s Differential Equation
The importance of (15.10.1) is that any homogeneous linear differential equation of the second order with at most three distinct singularities, all regular, in the extended plane can be transformed into (15.10.1). The most general form is given by … denotes the set of solutions of (15.10.1).
###### §15.11(ii) Transformation Formulas
The reduction of a general homogeneous linear differential equation of the second order with at most three regular singularities to the hypergeometric differential equation is given by …