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21: 36.12 Uniform Approximation of Integrals
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►Also, is real analytic, and for all such that all critical points coincide.
…The critical points , , are defined by
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►Define a mapping by relating to the normal form (36.2.1) of in the following way:
…Correspondence between the and the is established by the order of critical points along the real axis when and are such that these critical points are all real, and by continuation when some or all of the critical points are complex.
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►For , with a single parameter , let the two critical points of be denoted by , with for those values of for which these critical points are real.
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22: 29.18 Mathematical Applications
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►The wave equation
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29.18.1
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29.18.4
►where , , satisfy the differential equations
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►where , , each satisfy the Lamé wave equation (29.11.1).
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23: 12.1 Special Notation
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►The main functions treated in this chapter are the parabolic cylinder functions (PCFs), also known as Weber parabolic cylinder functions: , , , and .
…An older notation, due to Whittaker (1902), for is .
The notations are related by .
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24: 12.13 Sums
25: 36.6 Scaling Relations
26: 13.5 Continued Fractions
27: 31.17 Physical Applications
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►The problem of adding three quantum spins , , and can be solved by the method of separation of variables, and the solution is given in terms of a product of two Heun functions.
We use vector notation (respective scalar ) for any one of the three spin operators (respective spin values).
►Consider the following spectral problem on the sphere : .
…for the common eigenfunction , where is the coupling parameter of interacting spins.
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28: 13.3 Recurrence Relations and Derivatives
29: 2.8 Differential Equations with a Parameter
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►in which is a real or complex parameter, and asymptotic solutions are needed for large that are uniform with respect to in a point set in or .
For example, can be the order of a Bessel function or degree of an orthogonal polynomial.
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►The parameter is assumed to be real and positive.
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►The transformed differential equation is
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►Then as
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