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21: 6.10 Other Series Expansions
22: 8.18 Asymptotic Expansions of
§8.18 Asymptotic Expansions of
… ►If and , then the -term can be omitted and the result is exact. ►If and and are fixed, with and , then (8.18.1), with and interchanged and replaced by , can be combined with (8.17.4). … ►A recurrence relation for the can be found in Nemes and Olde Daalhuis (2016). … ►
8.18.18
,
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23: 2.3 Integrals of a Real Variable
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►Other types of singular behavior in the integrand can be treated in an analogous manner.
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►
2.3.13
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►Watson’s lemma can be regarded as a special case of this result.
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►oscillate rapidly and cancel themselves over most of the range.
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►A uniform approximation can be constructed by quadratic change of integration variable:
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24: 10.45 Functions of Imaginary Order
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►and , are real and linearly independent solutions of (10.45.1):
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►In consequence of (10.45.5)–(10.45.7), and comprise a numerically satisfactory pair of solutions of (10.45.1) when is large, and either and , or and , comprise a numerically satisfactory pair when is small, depending whether or .
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►For graphs of and see §10.26(iii).
►For properties of and , including uniform asymptotic expansions for large and zeros, see Dunster (1990a).
In this reference is denoted by .
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25: 8.28 Software
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►Citations in bulleted lists refer to papers for which research software has been made available and can be downloaded via the Web.
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26: 10.46 Generalized and Incomplete Bessel Functions; Mittag-Leffler Function
27: 1.2 Elementary Algebra
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►If , , and are real the complex conjugate bars can be omitted in (1.2.40)–(1.2.42).
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►A vector of norm unity is normalized and every non-zero vector
can be normalized via .
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►The identity matrix
, is defined as
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►We take , but we can also restrict ourselves to vectors and matrices with only real elements.
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►Non-defective matrices are precisely the matrices which can be diagonalized via a similarity transformation of the form
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28: 36.12 Uniform Approximation of Integrals
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►
36.12.1
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►As varies as many as (real or complex) critical points of the smooth phase function
can coalesce in clusters of two or more.
…If , then we may evaluate the complex conjugate of for real values of and , and obtain by conjugation and analytic continuation.
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►This technique can be applied to generate a hierarchy of approximations for the diffraction catastrophes in (36.2.10) away from , in terms of canonical integrals for .
For example, the diffraction catastrophe defined by (36.2.10), and corresponding to the Pearcey integral (36.2.14), can be approximated by the Airy function when is large, provided that and are not small.
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29: 11.6 Asymptotic Expansions
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►More fully, the series (11.2.1) and (11.2.2) can be regarded as generalized asymptotic expansions (§2.1(v)).
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►These and higher coefficients
can be computed via the representations in Nemes (2015b).
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►
11.6.9
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