essential%20singularity
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1: 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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►If the poles are infinite in number, then the point at infinity is called an essential singularity: it is the limit point of the poles.
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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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2: Bibliography K
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Essential singularity of the Painlevé function of the second kind and the nonlinear Stokes phenomenon.
Zap. Nauchn. Sem. Leningrad. Otdel. Mat. Inst. Steklov.
(LOMI) 187, pp. 139–170 (Russian).
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Asymptotic approximations for the first incomplete elliptic integral near logarithmic singularity.
J. Comput. Appl. Math. 205 (1), pp. 186–206.
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Algorithm 737: INTLIB: A portable Fortran 77 interval standard-function library.
ACM Trans. Math. Software 20 (4), pp. 447–459.
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Methods of computing the Riemann zeta-function and some generalizations of it.
USSR Comput. Math. and Math. Phys. 20 (6), pp. 212–230.
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Connection formulae for asymptotics of solutions of the degenerate third Painlevé equation. I.
Inverse Problems 20 (4), pp. 1165–1206.
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3: 18.40 Methods of Computation
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►Results of low ( to decimal digits) precision for are easily obtained for to .
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►This is a challenging case as the desired on has an essential singularity at .
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4: 18.39 Applications in the Physical Sciences
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►Derivations of (18.39.42) appear in Bethe and Salpeter (1957, pp. 12–20), and Pauling and Wilson (1985, Chapter V and Appendix VII), where the derivations are based on (18.39.36), and is also the notation of Piela (2014, §4.7), typifying the common use of the associated Coulomb–Laguerre polynomials in theoretical quantum chemistry.
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►The Schrödinger operator essential singularity, seen in the accumulation of discrete eigenvalues for the attractive Coulomb problem, is mirrored in the accumulation of jumps in the discrete Pollaczek–Stieltjes measure as .
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5: 32.2 Differential Equations
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►be a nonlinear second-order differential equation in which is a rational function of and , and is locally analytic in , that is, analytic except for isolated singularities in .
In general the singularities of the solutions are movable in the sense that their location depends on the constants of integration associated with the initial or boundary conditions.
An equation is said to have the Painlevé property if all its solutions are free from movable branch points; the solutions may have movable poles or movable isolated essential singularities (§1.10(iii)), however.
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6: 14.32 Methods of Computation
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►Essentially the same comments that are made in §15.19 concerning the computation of hypergeometric functions apply to the functions described in the present chapter.
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7: 1.18 Linear Second Order Differential Operators and Eigenfunction Expansions
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►An essential feature of such symmetric operators is that their eigenvalues are real, and eigenfunctions
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►In unusual cases , even for all , such as in the case of the Schrödinger–Coulomb problem () discussed in §18.39 and §33.14, where the point spectrum actually accumulates at the onset of the continuum at , implying an essential singularity, as well as a branch point, in matrix elements of the resolvent, (1.18.66).
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►If then is essentially self-adjoint and if then is self-adjoint.
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8: 34.12 Physical Applications
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►The angular momentum coupling coefficients (, , and symbols) are essential in the fields of nuclear, atomic, and molecular physics.
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9: 31.13 Asymptotic Approximations
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►For asymptotic approximations of the solutions of Heun’s equation (31.2.1) when two singularities are close together, see Lay and Slavyanov (1999).
►For asymptotic approximations of the solutions of confluent forms of Heun’s equation in the neighborhood of irregular singularities, see Komarov et al. (1976), Ronveaux (1995, Parts B,C,D,E), Bogush and Otchik (1997), Slavyanov and Veshev (1997), and Lay et al. (1998).