intelligible
发表于 2025-3-23 10:09:16
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自由职业者
发表于 2025-3-23 16:41:51
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Ordnance
发表于 2025-3-23 21:35:39
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UTTER
发表于 2025-3-23 23:18:32
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Regurgitation
发表于 2025-3-24 02:55:03
Foundations of Differential Calculusach of the books by Erdelyi (1956) and Jeffreys (1966) is devoted to ordinary differential equations. In the partial differential equation area the books by Van Dyke (1964) and Cole (1968)† are of importance in the particular area of asymptotic analysis called singular perturbation theory.
NICE
发表于 2025-3-24 10:07:54
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防水
发表于 2025-3-24 11:13:05
Method of stationary phase, will be seen in §4.2 below, is in itself a valid reason for obtaining the asymptotic expansion. In §4.2 a brief introduction is given to dispersive wave motion which is of current interest and practical importance: the most exciting developments in the subject have appeared since about 1960.
镇压
发表于 2025-3-24 17:01:29
Differential equations,ach of the books by Erdelyi (1956) and Jeffreys (1966) is devoted to ordinary differential equations. In the partial differential equation area the books by Van Dyke (1964) and Cole (1968)† are of importance in the particular area of asymptotic analysis called singular perturbation theory.
defeatist
发表于 2025-3-24 22:58:05
Asymptotic expansions,ean one that is given in terms of functions whose properties are known or tabulated: Bessel functions, trigonometric functions, Legendre functions, exponentials, and so on are typical examples. Such a solution may not be particularly useful, however, from either a computational or analytical point o
BROTH
发表于 2025-3-25 01:29:12
,Laplace’s method for integrals,res but it is rather limited in its applicability. The procedure is essentially to integrate by parts and then show that the resulting series is asymptotic by estimating the remainder which is in the form of an integral: this is exactly what was done in §1.1 to obtain (1.11) for Ei(.) as . → ∞. We i