Filomat 2015 Volume 29, Issue 7, Pages: 1671-1680
https://doi.org/10.2298/FIL1507671M
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Resolvent operator and spectrum of new type boundary value problems
Mukhtarov Oktay Sh. (Gaziosmanpaşa University, Faculty of Science-Art, Department of Mathematics, Tokat, Turkey + Azerbaijan National Academy of Sciences, Institute of Mathematics and Mechanics, Baku, Azerbaijan)
Olğar Hayati (Gaziosmanpaşa University, Faculty of Science-Art, Department of Mathematics, Tokat, Turkey)
Aydemir Kadriye (Gaziosmanpaşa University, Faculty of Science-Art, Department of Mathematics, Tokat, Turkey)
The aim of this study is to investigate a new type boundary value problems
which consist of the equation -y''(x) + (By)(x) = αy(x) on two disjoint
intervals (-1,0) and (0,1) together with transmission conditions at the point
of interaction x = 0 and with eigenparameter dependent boundary conditions,
where B is an abstract linear operator, unbounded in general, in the direct
sum of Lebesgue spaces L2(-1,0)( L2(0,1). By suggesting an own approaches we
introduce modified Hilbert space and linear operator in it such a way that
the considered problem can be interpreted as an eigenvalue problem of this
operator. We establish such properties as isomorphism and coerciveness with
respect to spectral parameter, maximal decreasing of the resolvent operator
and discreteness of the spectrum. Further we examine asymptotic behaviour of
the eigenvalues.
Keywords: Boundary-value problems, transmission conditions, eigenvalues, coerciveness, spectrum, resolvent