singularity parameter
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21: 31.18 Methods of Computation
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►Independent solutions of (31.2.1) can be computed in the neighborhoods of singularities from their Fuchs–Frobenius expansions (§31.3), and elsewhere by numerical integration of (31.2.1).
…The computation of the accessory parameter for the Heun functions is carried out via the continued-fraction equations (31.4.2) and (31.11.13) in the same way as for the Mathieu, Lamé, and spheroidal wave functions in Chapters 28–30.
22: 12.16 Mathematical Applications
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►PCFs are used as basic approximating functions in the theory of contour integrals with a coalescing saddle point and an algebraic singularity, and in the theory of differential equations with two coalescing turning points; see §§2.4(vi) and 2.8(vi).
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►PCFs are also used in integral transforms with respect to the parameter, and inversion formulas exist for kernels containing PCFs.
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23: 10.2 Definitions
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§10.2(i) Bessel’s Equation
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10.2.1
►This differential equation has a regular singularity at with indices , and an irregular singularity at of rank ; compare §§2.7(i) and 2.7(ii).
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10.2.2
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10.2.3
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24: 15.10 Hypergeometric Differential Equation
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►It has regular singularities at , with corresponding exponent pairs , , , respectively.
…They are also numerically satisfactory (§2.7(iv)) in the neighborhood of the corresponding singularity.
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Singularity
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…25: 36.6 Scaling Relations
26: 31.3 Basic Solutions
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31.3.2
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31.3.5
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►In general, one of them has a logarithmic singularity at .
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§31.3(ii) Fuchs–Frobenius Solutions at Other Singularities
… ►Solutions (31.3.1) and (31.3.5)–(31.3.11) comprise a set of 8 local solutions of (31.2.1): 2 per singular point. …27: 13.2 Definitions and Basic Properties
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Kummer’s Equation
… ►This equation has a regular singularity at the origin with indices and , and an irregular singularity at infinity of rank one. …In effect, the regular singularities of the hypergeometric differential equation at and coalesce into an irregular singularity at . … ►
13.2.11
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28: Bibliography M
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On one-parameter families of Painlevé III.
Stud. Appl. Math. 101 (3), pp. 321–341.
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On the Representation of Meijer’s -Function in the Vicinity of Singular Unity.
In Complex Analysis and Applications ’81 (Varna, 1981),
pp. 383–398.
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On the convergence of the Chebyshev series for functions possessing a singularity in the range of representation.
SIAM J. Numer. Anal. 3 (3), pp. 390–409.
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Singular integrals whose kernels involve certain Sturm-Liouville functions. I.
J. Math. Mech. 19 (10), pp. 855–873.
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Hyperasymptotic solutions of second-order ordinary differential equations with a singularity of arbitrary integer rank.
Methods Appl. Anal. 4 (3), pp. 250–260.
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29: 16.21 Differential Equation
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16.21.1
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►With the classification of §16.8(i), when the only singularities of (16.21.1) are a regular singularity at and an irregular singularity at .
When the only singularities of (16.21.1) are regular singularities at , , and .
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16.21.2
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