Results 91 to 100 of about 21,050 (203)

The nonlocal problem for the $2n$ differential equations with unbounded operator coefficients and the involution

Karpatsʹkì Matematičnì Publìkacìï, 2018
We study a problem with periodic boundary conditions for a $2n$-order differential equation whose coefficients are non-self-adjoint operators. It is established that the operator of the problem has two invariant subspaces generated by the involution ...
Ya.O. Baranetskij, I.I. Demkiv, I.Ya. Ivasiuk, M.I. Kopach   +3 more
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A nonlocal problem for mixed type equation with singular coefficient in domain with half-strip as hyperbolic part

Vestnik Samarskogo Gosudarstvennogo Tehničeskogo Universiteta. Seriâ: Fiziko-Matematičeskie Nauki, 2014
A nonlocal problem for mixed type equation with a singular coefficient and the spectral parameter is formulated in the field, which hyperbolic part is vertical half-strip and elliptic part is rectangle.
Anton A Abashkin
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Angle criteria for frame sequences and frames containing a Riesz basis

Journal of Mathematical Analysis and Applications, 2008
zbMATH Open Web Interface contents unavailable due to conflicting licenses.
Ha, Young-Hwa, Ryu, Han-Young, Shin, In-Sook   +2 more
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An Explicit Structure for Duals of Frames in Krein Spaces [PDF]

Sahand Communications in Mathematical Analysis
In this study, motivating the explanation of Esmeral, Ferrer, and Wagner, similar findings regarding frames in Hilbert spaces were attempted to be extended to Krein spaces.
Elnaz Osgooei, Asghar Rahimi
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Riesz basis and exponential stability for Euler-bernoulli beams with variable coefficients and indefinite damping under a force control in position and velocity

Electronic Journal of Differential Equations, 2015
This article concerns the Riesz basis property and the stability of a damped Euler-Bernoulli beam with nonuniform thickness or density, that is clamped at one end and is free at the other.
K. Augustin Toure, Adama Coulibaly, Ayo A. Hermith Kouassi   +2 more
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Spectral characteristics of a nonlocal problem for two linear systems of partial differential equations

Vestnik Samarskogo Gosudarstvennogo Tehničeskogo Universiteta. Seriâ: Fiziko-Matematičeskie Nauki, 2017
We study the boundary-value problem for a linear system of differential equations written in the form of differential-operator equations $$ aD_t u(t)+bBu(t)=f(t) $$ with nonlocal boundary conditions at $t$.
Dmitriy V Kornienko
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A Riesz basis for Bargmann-Fock space related to sampling and interpolation

Arkiv för Matematik, 1992
Let \(A^ p(C)\), \(1\leq ...
Gröchenig, K., Walnut, D.
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On the Riesz Basisness of Systems Composed of Root Functions of Periodic Boundary Value Problems

Abstract and Applied Analysis, 2015
We consider the nonself-adjoint Sturm-Liouville operator with q∈L1[0,1] and either periodic or antiperiodic boundary conditions. We obtain necessary and sufficient conditions for systems of root functions of these operators to be a Riesz basis in L2[0,1]
Alp Arslan Kıraç
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The nonlocal problem for the differential-operator equation of the even order with the involution

Karpatsʹkì Matematičnì Publìkacìï, 2018
In this paper, the problem with boundary nonself-adjoint conditions for a differential-operator equations of the order $2n$ with involution is studied. Spectral properties of operator of the problem is investigated.
Ya.O. Baranetskij, P.I. Kalenyuk, L.I. Kolyasa, M.I. Kopach   +3 more
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Basis properties of eigenfunctions of nonlinear Sturm-Liouville problems

Electronic Journal of Differential Equations, 2000
We consider three nonlinear eigenvalue problems that consist of $$-y''+f(y^2)y=lambda y$$ with one of the following boundary conditions: $$displaylines{ y(0)=y(1)=0 quad y'(0)=p ,,cr y'(0)=y(1)=0 quad y(0)=p,, cr y'(0)=y'(1)=0 quad y(0)=p,, }$$ where $p$
Peter E. Zhidkov
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