Regular Variation and Differential Equations
Regular Variation and Differential Equations
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DOI:
10.1007/bfb0103952
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发表时间:
2000-04
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影响因子:
--
通讯作者:
V. Marić
中科院分区:
文献类型:
--
作者:
V. Marić
The notion of regular variation was discovered by Jovan Karamata in his famous paper of 1930" Sur une mode des croissance reguliére des fonctions". Karamata's aim was Tauberian theory, one of the highlights of the epoch marked by the work of eminent analysts, predominantly that of GH Hardy, JL Littlewood and also of E. Landau, culminating in N. Wiener's general Tauberian theorem in 1932. However, in addition to proving Tauberian theorems first for Laplace-Stieltjes and later for the more general integral transforms of convolution type, regular variation was soon applied in Abelian theorems, giving in fact asymptotic behavior of integrals and series, the Fourier ones in particular. Further applications in analysis include Mercerian theorems, analytic number theory, complex analysis-entire functions in particular. With W. Feller's well known treatise of 1968,[14], regular variation was recognized as a major tool in the probability theory and its applications. A new impetus to the subject was provided by the L. de Haan work in 1970,[23], where he introduced a substantial generalization of regular variation, aiming again primarily at the probability theory. This can be found in the monograph of JL Geluk and L. de Haan of 1987,[18]. The first paper connecting regular variation and the differential equation is the one of VG Avakumović of 1947," Sur l'équation différentielle de Thomas-Fermi". His paper did not attract much attention-regularly varying functions were totally distant from the theory of differential equation at that time, until the investigations of M. Tomić and the author started in 1976,[37]. The first study of the linear equations is that of E. Omey in 1981,[55]. The most complete presentation of Karamata theory and its generalizations as well as the majority of the applications are contained in the book of 1987 by NH Bingham, CM Goldie and JL Teugels [9]. Rudimentary results on differential equations form its Appendix 2. The first monograph on the subject is the one of E. Seneta of 1976,[60]. The core of this treatise is based on joint results of Miodrag Tomić and the author. Significant contribution to the main theme of the book are the included results of JL Geluk and E. Omey and the joint ones of HC Howard and the author. Although Miodrag Tomić is formally not an author of this book, the whole text is permeated with his influence and ideas. This holds both for conjectures leading to a number of theorems and for many special techniques and devices needed for the proofs where general methods