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1: 16.26 Approximations
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►For discussions of the approximation of generalized hypergeometric functions and the Meijer -function in terms of polynomials, rational functions, and Chebyshev polynomials see Luke (1975, §§5.12 - 5.13) and Luke (1977b, Chapters 1 and 9).
2: Sidebar 21.SB2: A two-phase solution of the Kadomtsev–Petviashvili equation (21.9.3)
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►Such a solution is given in terms of a Riemann theta function with two phases.
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3: 19.38 Approximations
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►Minimax polynomial approximations (§3.11(i)) for and in terms of with can be found in Abramowitz and Stegun (1964, §17.3) with maximum absolute errors ranging from 4×10⁻⁵ to 2×10⁻⁸.
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►The accuracy is controlled by the number of terms retained in the approximation; for real variables the number of significant figures appears to be roughly twice the number of terms retained, perhaps even for near with the improvements made in the 1970 reference.
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4: 33.19 Power-Series Expansions in
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33.19.1
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►Here is defined by (33.14.6), is defined by (33.14.11) or (33.14.12), , , and
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33.19.6
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►with , and
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33.19.7
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5: Guide to Searching the DLMF
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term:
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6: 12.16 Mathematical Applications
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7: 18.24 Hahn Class: Asymptotic Approximations
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►In particular, asymptotic formulas in terms of elementary functions are given when is real and fixed.
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►This expansion is in terms of the parabolic cylinder function and its derivative.
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►This expansion is in terms of confluent hypergeometric functions.
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►Both expansions are in terms of parabolic cylinder functions.
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Approximations in Terms of Laguerre Polynomials
…8: 6.12 Asymptotic Expansions
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►For these and other error bounds see Olver (1997b, pp. 109–112) with .
►For re-expansions of the remainder term leading to larger sectors of validity, exponential improvement, and a smooth interpretation of the Stokes phenomenon, see §§2.11(ii)–2.11(iv), with .
…If the expansion is terminated at the th term, then the remainder term is bounded by times the next term.
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►The remainder terms are given by
…When , these remainders are bounded in magnitude by the first neglected terms in (6.12.3) and (6.12.4), respectively, and have the same signs as these terms when .
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9: 7.16 Generalized Error Functions
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►These functions can be expressed in terms of the incomplete gamma function (§8.2(i)) by change of integration variable.