regularization
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31: 31.14 General Fuchsian Equation
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►The general second-order Fuchsian equation with
regular singularities at , , and at , is given by
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32: 1.15 Summability Methods
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§1.15(ii) Regularity
►Methods of summation are regular if they are consistent with conventional summation. All of the methods described in §1.15(i) are regular. …33: 2.6 Distributional Methods
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§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. …34: 1.13 Differential Equations
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►on a finite interval , this is then a regular Sturm-Liouville system.
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►A regular Sturm-Liouville system will only have solutions for certain (real) values of , these are eigenvalues.
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►For a regular Sturm-Liouville system, equations (1.13.26) and (1.13.29) have: (i) identical eigenvalues, ; (ii) the corresponding (real) eigenfunctions, and , have the same number of zeros, also called nodes, for as for ; (iii) the eigenfunctions also satisfy the same type of boundary conditions, un-mixed or periodic, for both forms at the corresponding boundary points.
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35: Bibliography
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Computation of the regular confluent hypergeometric function.
The Mathematica Journal 5 (4), pp. 74–76.
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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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36: 31.2 Differential Equations
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►This equation has regular singularities at , with corresponding exponents , , , , respectively (§2.7(i)).
All other homogeneous linear differential equations of the second order having four regular singularities in the extended complex plane, , can be transformed into (31.2.1).
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37: 33.22 Particle Scattering and Atomic and Molecular Spectra
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►For scattering problems, the interior solution is then matched to a linear combination of a pair of Coulomb functions, and , or and , to determine the scattering -matrix and also the correct normalization of the interior wave solutions; see Bloch et al. (1951).
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►The penetrability of repulsive Coulomb potential barriers is normally expressed in terms of the quantity (Mott and Massey (1956, pp. 63–65)).
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38: 1.16 Distributions
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►A distribution is called regular if there is a locally integrable function on (i.
…We denote a regular distribution by , or simply , where is the function giving rise to the distribution.
(If a distribution is not regular, it is called singular.)
More generally, for a nondecreasing function the corresponding Lebesgue–Stieltjes measure (see §1.4(v)) can be considered as a distribution:
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39: 10.2 Definitions
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►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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40: 27.2 Functions
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►They tend to thin out among the large integers, but this thinning out is not completely regular.
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