solutions analytic at two singularities
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11: 1.10 Functions of a Complex Variable
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►Lastly, if for infinitely many negative , then is an isolated essential singularity.
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►In any neighborhood of an isolated essential singularity, however small, an analytic function assumes every value in with at most one exception.
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►has a unique solution
analytic at
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►Furthermore, if is analytic at
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►Also, if in addition is analytic at
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12: 10.2 Definitions
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§10.2(i) Bessel’s Equation
… ►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). … ►This solution of (10.2.1) is an analytic function of , except for a branch point at when is not an integer. … ►Each solution has a branch point at for all . … ►§10.2(iii) Numerically Satisfactory Pairs of Solutions
…13: Bibliography B
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Singularities in Waves and Rays.
In Les Houches Lecture Series Session XXXV, R. Balian, M. Kléman, and J.-P. Poirier (Eds.),
Vol. 35, pp. 453–543.
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The fifty-two icosahedral solutions to Painlevé VI.
J. Reine Angew. Math. 596, pp. 183–214.
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Problem of two Coulomb centres at large intercentre separation: Asymptotic expansions from analytical solutions of the Heun equation.
J. Phys. A 30 (2), pp. 559–571.
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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.
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An analytic continuation of the hypergeometric series.
SIAM J. Math. Anal. 18 (3), pp. 884–889.
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14: 31.15 Stieltjes Polynomials
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§31.15(i) Definitions
►Stieltjes polynomials are polynomial solutions of the Fuchsian equation (31.14.1). …There exist at most polynomials of degree not exceeding such that for , (31.15.1) has a polynomial solution of degree . … ►If the exponent and singularity parameters satisfy (31.15.5)–(31.15.6), then for every multi-index , where each is a nonnegative integer, there is a unique Stieltjes polynomial with zeros in the open interval for each . … ►For further details and for the expansions of analytic functions in this basis see Volkmer (1999).15: 15.2 Definitions and Analytical Properties
§15.2 Definitions and Analytical Properties
… ►again with analytic continuation for other values of , and with the principal branch defined in a similar way. … ►§15.2(ii) Analytic Properties
… ►As a multivalued function of , is analytic everywhere except for possible branch points at , , and . … ►(Both interpretations give solutions of the hypergeometric differential equation (15.10.1), as does , which is analytic at .) …16: 18.40 Methods of Computation
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