asymptotic expansions for small parameters
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21: 33.12 Asymptotic Expansions for Large
§33.12 Asymptotic Expansions for Large
… ►For asymptotic expansions of and when see Temme (2015, Chapter 31). ►§33.12(ii) Uniform Expansions
… ►The first set is in terms of Airy functions and the expansions are uniform for fixed and , where is an arbitrary small positive constant. … ►22: 8.18 Asymptotic Expansions of
§8.18 Asymptotic Expansions of
… ►§8.18(ii) Large Parameters: Uniform Asymptotic Expansions
… ►Symmetric Case
… ►General Case
… ►Inverse Function
…23: 13.19 Asymptotic Expansions for Large Argument
§13.19 Asymptotic Expansions for Large Argument
… ►Again, denotes an arbitrary small positive constant. … ►Error bounds and exponentially-improved expansions are derivable by combining §§13.7(ii) and 13.7(iii) with (13.14.2) and (13.14.3). … ►For an asymptotic expansion of as that is valid in the sector and where the real parameters , are subject to the growth conditions , , see Wong (1973a).24: 2.4 Contour Integrals
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§2.4(i) Watson’s Lemma
… ►Then … ►For examples see Olver (1997b, pp. 315–320). ►§2.4(iii) Laplace’s Method
… ►In consequence, the asymptotic expansion obtained from (2.4.14) is no longer null. …25: 30.16 Methods of Computation
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►For small
we can use the power-series expansion (30.3.8).
…If is large we can use the asymptotic expansions in §30.9.
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►If is large, then we can use the asymptotic expansions referred to in §30.9 to approximate .
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►A fourth method, based on the expansion (30.8.1), is as follows.
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30.16.8
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26: 28.34 Methods of Computation
27: 16.11 Asymptotic Expansions
§16.11 Asymptotic Expansions
►§16.11(i) Formal Series
… ►§16.11(ii) Expansions for Large Variable
… ►§16.11(iii) Expansions for Large Parameters
… ►Asymptotic expansions for the polynomials as through integer values are given in Fields and Luke (1963b, a) and Fields (1965).28: 16.5 Integral Representations and Integrals
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16.5.1
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►In this event, the formal power-series expansion of the left-hand side (obtained from (16.2.1)) is the asymptotic expansion of the right-hand side as in the sector , where is an arbitrary small positive constant.
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16.5.2
,
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16.5.3
, ,
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►Lastly, the restrictions on the parameters can be eased by replacing the integration paths with loop contours; see Luke (1969a, §3.6).
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29: 28.25 Asymptotic Expansions for Large
§28.25 Asymptotic Expansions for Large
… ►
28.25.1
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►The expansion (28.25.1) is valid for when
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28.25.4
,
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►where again denotes an arbitrary small positive constant.
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30: 18.24 Hahn Class: Asymptotic Approximations
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►For two asymptotic expansions of as , with and fixed, see Jin and Wong (1998) and Wang and Wong (2011).
The first expansion holds uniformly for , and the second for , being an arbitrary small positive constant.
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►Dunster (2001b) provides various asymptotic expansions for as , in terms of elementary functions or in terms of Bessel functions.
Taken together, these expansions are uniformly valid for and for in unbounded intervals—each of which contains , where again denotes an arbitrary small positive constant.
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►For an asymptotic expansion of as , with fixed, see Li and Wong (2001).
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