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Sibirskii Matematicheskii Zhurnal, 2017, Volume 58, Number 5, Pages 1091–1097
DOI: https://doi.org/10.17377/smzh.2017.58.511
(Mi smj2921)
 

On systems of linear functional equations of the second kind in $L_2$

V. B. Korotkov

Sobolev Institute of Mathematics, Novosibirsk, Russia
References:
Abstract: We consider a general system of functional equations of the second kind in $L_2$ with a continuous linear operator $T$ satisfying the condition that zero lies in the limit spectrum of the adjoint operator $T^*$. We show that this condition holds for the operators of a wide class containing, in particular, all integral operators. The system under study is reduced by means of a unitary transformation to an equivalent system of linear integral equations of the second kind in$L_2$ with Carleman matrix kernel of a special kind. By a linear continuous invertible change, this system is reduced to an equivalent integral equation of the second kind in $L_2$ with quasidegenerate Carleman kernel. It is possible to apply various approximate methods of solution for such an equation.
Keywords: system of linear functional equations of the second kind, integral operator, Carleman integral operator, Hilbert–Schmidt operator, Fredholm resolvent, resolvent kernel, spectrum, limit spectrum.
Received: 15.11.2016
English version:
Siberian Mathematical Journal, 2017, Volume 58, Issue 5, Pages 845–849
DOI: https://doi.org/10.1134/S0037446617050111
Bibliographic databases:
Document Type: Article
UDC: 517.983+517.968.25
MSC: 35R30
Language: Russian
Citation: V. B. Korotkov, “On systems of linear functional equations of the second kind in $L_2$”, Sibirsk. Mat. Zh., 58:5 (2017), 1091–1097; Siberian Math. J., 58:5 (2017), 845–849
Citation in format AMSBIB
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\paper On systems of linear functional equations of the second kind in~$L_2$
\jour Sibirsk. Mat. Zh.
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\vol 58
\issue 5
\pages 1091--1097
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\crossref{https://doi.org/10.17377/smzh.2017.58.511}
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\jour Siberian Math. J.
\yr 2017
\vol 58
\issue 5
\pages 845--849
\crossref{https://doi.org/10.1134/S0037446617050111}
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    Сибирский математический журнал Siberian Mathematical Journal
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