Asymptotics of Linear Differential Equations

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Springer Science & Business Media, Sep 30, 2001 - Mathematics - 441 pages
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The asymptotic theory deals with the problern of determining the behaviour of a function in a neighborhood of its singular point. The function is replaced by another known function ( named the asymptotic function) close (in a sense) to the function under consideration. Many problems of mathematics, physics, and other divisions of natural sci ence bring out the necessity of solving such problems. At the present time asymptotic theory has become an important and independent branch of mathematical analysis. The present consideration is mainly based on the theory of asymp totic spaces. Each asymptotic space is a collection of asymptotics united by an associated real function which determines their growth near the given point and (perhaps) some other analytic properties. The main contents of this book is the asymptotic theory of ordinary linear differential equations with variable coefficients. The equations with power order growth coefficients are considered in detail. As the application of the theory of differential asymptotic fields, we also consider the following asymptotic problems: the behaviour of explicit and implicit functions, improper integrals, integrals dependent on a large parameter, linear differential and difference equations, etc .. The obtained results have an independent meaning. The reader is assumed to be familiar with a comprehensive course of the mathematical analysis studied, for instance at mathematical departments of universities. Further necessary information is given in this book in summarized form with proofs of the main aspects.
 

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Contents

II
1
III
5
IV
9
V
11
VI
14
VII
16
VIII
17
IX
22
XLVII
183
XLVIII
193
XLIX
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L
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LI
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LII
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LIII
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LIV
230

X
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XIV
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XV
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XVI
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XXVII
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XXVIII
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XXIX
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XXX
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XXXI
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XXXII
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XXXIII
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XXXIV
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XXXV
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XXXVI
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XXXVII
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XXXVIII
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XXXIX
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XL
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XLI
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XLII
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XLIII
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XLIV
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XLV
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XLVI
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LV
233
LVI
247
LVII
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LVIII
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LIX
270
LX
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LXI
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LXII
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LXIII
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LXIV
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LXV
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LXVI
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LXVII
314
LXVIII
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LXIX
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LXX
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LXXI
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LXXII
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LXXIII
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LXXIV
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LXXV
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LXXVI
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LXXVII
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LXXVIII
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LXXIX
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LXXX
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LXXXI
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LXXXII
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LXXXIII
402
LXXXIV
411
LXXXV
413
LXXXVI
417
LXXXVII
420
LXXXVIII
425
LXXXIX
437
XC
438
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