accessory%20parameter
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1: 31.13 Asymptotic Approximations
§31.13 Asymptotic Approximations
►For asymptotic approximations for the accessory parameter eigenvalues , see Fedoryuk (1991) and Slavyanov (1996). …2: 31.18 Methods of Computation
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►The computation of the accessory parameter for the Heun functions is carried out via the continued-fraction equations (31.4.2) and (31.11.13) in the same way as for the Mathieu, Lamé, and spheroidal wave functions in Chapters 28–30.
3: 31.4 Solutions Analytic at Two Singularities: Heun Functions
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►For an infinite set of discrete values , , of the accessory parameter
, the function is analytic at , and hence also throughout the disk .
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31.4.1
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►The eigenvalues satisfy the continued-fraction equation
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31.4.2
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31.4.3
,
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4: 31.14 General Fuchsian Equation
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►The three sets of parameters comprise the singularity parameters
, the exponent parameters
, and the free accessory parameters
.
With and the total number of free parameters is .
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31.14.1
.
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31.14.3
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5: 31.2 Differential Equations
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►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).
►The parameters play different roles: is the singularity parameter; are exponent parameters; is the accessory parameter.
The total number of free parameters is six.
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►Then (suppressing the parameter
)
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►Except for the identity automorphism, each alters the parameters.
6: 31.16 Mathematical Applications
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►It describes the monodromy group of Heun’s equation for specific values of the accessory parameter.
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31.16.1
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31.16.3
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31.16.5
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31.16.6
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7: 31.11 Expansions in Series of Hypergeometric Functions
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31.11.3
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31.11.6
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31.11.7
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31.11.12
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►In this case the accessory parameter
is a root of the continued-fraction equation
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8: 31.15 Stieltjes Polynomials
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►If are the zeros of an th degree Stieltjes polynomial , then every zero is either one of the parameters
or a solution of the system of equations
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31.15.6
,
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►In this case the accessory parameters
are given by
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31.15.7
.
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►If the exponent and singularity parameters satisfy (31.15.5)–(31.15.6), then for every multi-index , where each is a nonnegative integer, there is a unique Stieltjes polynomial with zeros in the open interval for each .
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9: 20 Theta Functions
Chapter 20 Theta Functions
…10: Guide to Searching the DLMF
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