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Izvestiya of Saratov University. Mathematics. Mechanics. Informatics, 2020, Volume 20, Issue 3, Pages 297–309
DOI: https://doi.org/10.18500/1816-9791-2020-20-3-297-309
(Mi isu848)
 

Scientific Part
Mathematics

New method for investigating the Hilbert boundary value problem with an infinite logarithmic order index

R. B. Salimov, E. N. Khasanova

Kazan State University of Architecture and Engineering, 1 Zelenaya St., Kazan 420043, Russia
References:
Abstract: We consider the problem of identification of the analytical in the complex upper half plane by boundary condition on the entire real axis, according to which, the real part of the product, by the given on the real axis complex function and the boundary values of the desired analytical function equal zero everywhere on the real axis. It is assumed that the argument of the coefficient of the boundary condition turns to infinity as one or another degree of the logarithm of the module of the coordinate of the axis point with unlimited distance of this point from the origin in one or another direction. Derived the formula that defines an analytical function in the upper half-plane, the imaginary part of which, when the coordinate of the axis point of the positive half-axis tends to infinity, is infinitely large of the same order as the argument of the coefficient of the boundary condition. Then derived a similar analytical function, the imaginary part of which turns to infinity of the same order as the argument of the coefficient of the boundary condition, when the points of the negative real axis are removed to infinity. We eliminate the infinite gap of the argument of the coefficient of the boundary condition by using these two functions. So the problem reduced to a finite index problem by techniques similar to F. D. Gakhov method. The method of F. D. Gakhov is used to solve the last problem. The solution depends on an arbitrary integer function of zero order, whose module satisfy to an additional condition.
Key words: Hilbert boundary value problem, analytical function, infinite index, logarithmic order.
Funding agency Grant number
Russian Foundation for Basic Research 18-31-00060
This work was supported by the Russian Foundation for Basic Research (project No. 18-31-00060).
Received: 16.04.2019
Revised: 15.03.2020
Bibliographic databases:
Document Type: Article
UDC: 517.54
Language: Russian
Citation: R. B. Salimov, E. N. Khasanova, “New method for investigating the Hilbert boundary value problem with an infinite logarithmic order index”, Izv. Saratov Univ. Math. Mech. Inform., 20:3 (2020), 297–309
Citation in format AMSBIB
\Bibitem{SalKha20}
\by R.~B.~Salimov, E.~N.~Khasanova
\paper New method for investigating the Hilbert boundary value problem with an infinite logarithmic order index
\jour Izv. Saratov Univ. Math. Mech. Inform.
\yr 2020
\vol 20
\issue 3
\pages 297--309
\mathnet{http://mi.mathnet.ru/isu848}
\crossref{https://doi.org/10.18500/1816-9791-2020-20-3-297-309}
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    Известия Саратовского университета. Новая серия. Серия Математика. Механика. Информатика
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