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31: 3.4 Differentiation
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3.4.17
►where is a simple closed contour described in the positive rotational sense such that and its interior lie in the domain of analyticity of , and is interior to .
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32: 10.74 Methods of Computation
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►If values of the Bessel functions , , or the other functions treated in this chapter, are needed for integer-spaced ranges of values of the order , then a simple and powerful procedure is provided by recurrence relations typified by the first of (10.6.1).
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33: 25.15 Dirichlet -functions
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►For the principal character , is analytic everywhere except for a simple pole at with residue , where is Euler’s totient function (§27.2).
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34: 3.7 Ordinary Differential Equations
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►For applications to special functions , , and are often simple rational functions.
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►The eigenvalues are simple, that is, there is only one corresponding eigenfunction (apart from a normalization factor), and when ordered increasingly the eigenvalues satisfy
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35: 22.4 Periods, Poles, and Zeros
36: 23.2 Definitions and Periodic Properties
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►The poles of are double with residue ; the poles of are simple with residue .
The function is entire and odd, with simple zeros at the lattice points.
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37: 29.12 Definitions
38: Bibliography R
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On Simple Waves with Profiles in the form of some Special Functions—Chebyshev-Hermite, Mathieu, Whittaker—in Two-phase Media.
In Differential Operators and Related Topics, Vol. I (Odessa,
1997),
Operator Theory: Advances and Applications, Vol. 117, pp. 313–322.
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39: 2.10 Sums and Sequences
40: 1.18 Linear Second Order Differential Operators and Eigenfunction Expansions
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►For to be actually self adjoint it is necessary to also show that , as it is often the case that and have different domains, see Friedman (1990, p 148) for a simple example of such differences involving the differential operator .
►This question may be rephrased by asking: do and satisfy the same boundary conditions which are needed to fully specify the solutions of a second order linear differential equation? A simple example is the choice , and , this being only one of many.
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