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31: 36.7 Zeros
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►Deep inside the bifurcation set, that is, inside the three-cusped astroid (36.4.10) and close to the part of the -axis that is far from the origin, the zero contours form an array of rings close to the planes
…There are also three sets of zero lines in the plane related by rotation; these are zeros of (36.2.20), whose asymptotic form in polar coordinates is given by
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32: 1.11 Zeros of Polynomials
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§1.11(iii) Polynomials of Degrees Two, Three, and Four
…33: 12.17 Physical Applications
34: 18.24 Hahn Class: Asymptotic Approximations
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►When the parameters and are fixed and the ratio is a constant in the interval (0,1), uniform asymptotic formulas (as ) of the Hahn polynomials can be found in Lin and Wong (2013) for in three overlapping regions, which together cover the entire complex plane.
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35: 19.7 Connection Formulas
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►There are three relations connecting and , where is a rational function of .
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►The first of the three relations maps each circular region onto itself and each hyperbolic region onto the other; in particular, it gives the Cauchy principal value of when (see (19.6.5) for the complete case).
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36: 29.7 Asymptotic Expansions
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►Müller (1966a, b) found three formal asymptotic expansions for a fundamental system of solutions of (29.2.1) (and (29.11.1)) as , one in terms of Jacobian elliptic functions and two in terms of Hermite polynomials.
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37: 30.2 Differential Equations
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►The equation contains three real parameters , , and .
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38: 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
.
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39: 36.5 Stokes Sets
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Elliptic Umbilic Stokes Set (Codimension three)
►This consists of three separate cusp-edged sheets connected to the cusp-edged sheets of the bifurcation set, and related by rotation about the -axis by . … ►Hyperbolic Umbilic Stokes Set (Codimension three)
…40: 16.4 Argument Unity
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►There are two types of three-term identities for ’s.
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►The other three-term relations are extensions of Kummer’s relations for ’s given in §15.10(ii).
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►The characterizing properties (18.22.2), (18.22.10), (18.22.19), (18.22.20), and (18.26.14) of the Hahn and Wilson class polynomials are examples of the contiguous relations mentioned in the previous three paragraphs.
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►One example of such a three-term relation is the recurrence relation (18.26.16) for Racah polynomials.
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►Relations between three solutions of three-term recurrence relations are given by Masson (1991).
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