transformations of parameters
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21: 31.7 Relations to Other Functions
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►Other reductions of to a , with at least one free parameter, exist iff the pair takes one of a finite number of values, where .
Below are three such reductions with three and two parameters.
They are analogous to quadratic and cubic hypergeometric transformations (§§15.8(iii)–15.8(v)).
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►Joyce (1994) gives a reduction in which the independent variable is transformed not polynomially or rationally, but algebraically.
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►The solutions (31.3.1) and (31.3.5) transform into even and odd solutions of Lamé’s equation, respectively.
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22: Bibliography F
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The transformation properties of the sixth Painlevé equation and one-parameter families of solutions.
Lett. Nuovo Cimento (2) 30 (17), pp. 539–544.
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23: 3.5 Quadrature
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3.5.39
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24: 32.8 Rational Solutions
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– possess hierarchies of rational solutions for special values of the parameters which are generated from “seed solutions” using the Bäcklund transformations and often can be expressed in the form of determinants.
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25: 19.13 Integrals of Elliptic Integrals
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►Cvijović and Klinowski (1994) contains fractional integrals (with free parameters) for and , together with special cases.
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§19.13(iii) Laplace Transforms
►For direct and inverse Laplace transforms for the complete elliptic integrals , , and see Prudnikov et al. (1992a, §3.31) and Prudnikov et al. (1992b, §§3.29 and 4.3.33), respectively.26: Bille C. Carlson
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►The main theme of Carlson’s mathematical research has been to expose previously hidden permutation symmetries that can eliminate a set of transformations and thereby replace many formulas by a few.
In his paper Lauricella’s hypergeometric function
(1963), he defined the -function, a multivariate hypergeometric function that is homogeneous in its variables, each variable being paired with a parameter.
If some of the parameters are equal, then the -function is symmetric in the corresponding variables.
This symmetry led to the development of symmetric elliptic integrals, which are free from the transformations of modulus and amplitude that complicate the Legendre theory.
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