irregular singularity
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11: 13.2 Definitions and Basic Properties
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►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 .
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12: Bibliography D
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Error bounds for exponentially improved asymptotic solutions of ordinary differential equations having irregular singularities of rank one.
Methods Appl. Anal. 3 (1), pp. 109–134.
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13: 33.2 Definitions and Basic Properties
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§33.2(i) Coulomb Wave Equation
… ►This differential equation has a regular singularity at with indices and , and an irregular singularity of rank 1 at (§§2.7(i), 2.7(ii)). …14: 33.14 Definitions and Basic Properties
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§33.14(i) Coulomb Wave Equation
… ►Again, there is a regular singularity at with indices and , and an irregular singularity of rank 1 at . …15: 10.47 Definitions and Basic Properties
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►Equations (10.47.1) and (10.47.2) each have a regular singularity at with indices , , and an irregular singularity at of rank ; compare §§2.7(i)–2.7(ii).
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16: 13.14 Definitions and Basic Properties
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►It has a regular singularity at the origin with indices , and an irregular singularity at infinity of rank one.
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17: 28.2 Definitions and Basic Properties
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►This equation has regular singularities at 0 and 1, both with exponents 0 and , and an irregular singular point at .
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18: Bibliography E
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The Fuchsian equation of second order with four singularities.
Duke Math. J. 9 (1), pp. 48–58.
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Generalized Bernoulli numbers, generalized irregular primes, and class number.
Ann. Univ. Turku. Ser. A I 178, pp. 1–72.
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19: Bibliography
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Regular and irregular Coulomb wave functions expressed in terms of Bessel-Clifford functions.
J. Math. Physics 33, pp. 111–116.
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Unsteady lifting-line theory as a singular-perturbation problem.
J. Fluid Mech 153, pp. 59–81.
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Scattering by singular potentials with a perturbation – Theoretical introduction to Mathieu functions.
J. Mathematical Phys. 16, pp. 961–970.
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Singularities of Differentiable Maps. Vol. II.
Birkhäuser, Boston-Berlin.
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Singular Continuous Spectrum for a Class of Almost Periodic Jacobi Matrices.
Bulletin of the American Mathematical Society 6 (1), pp. 81–85.
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20: 18.39 Applications in the Physical Sciences
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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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►See Yamani and Fishman (1975) for for expansions of both the regular and irregular spherical Bessel functions, which are the Pollaczeks with , and Coulomb functions for fixed , Broad and Reinhardt (1976) for a many particle example, and the overview of Alhaidari et al. (2008).
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