Results 61 to 70 of about 539 (137)

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
doaj   +1 more source

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
doaj  

Research on fractional symmetry based on Riesz derivative

AIP Advances
The variational problem, Noether symmetry and conserved quantity, and Lie symmetry and conserved quantity of singular systems are investigated on the basis of Riesz derivatives.
Cai Wang, Chuan-Jing Song
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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
doaj   +1 more source

Structure and asymptotic expansion of eigenvalues of an integral-type nonlocal problem

Electronic Journal of Differential Equations, 2016
We study the structure of eigenvalues of second-order differential equations with nonlocal integral boundary conditions. Moreover, we consider the asymptotic expansion of the eigenvalues and the corresponding eigenfunctions, which shows that the ...
Zhong-Cheng Zhou, Fang-Fang Liao
doaj  

Two-channel sampling in wavelet subspaces

Analele Stiintifice ale Universitatii Ovidius Constanta: Seria Matematica, 2015
We develop two-channel sampling theory in the wavelet subspace V1 from the multi resolution analysis {Vj}j∈𝕫. Extending earlier results by G. G. Walter [11], W. Chen and S. Itoh [2] and Y. M.
Kim J.M., Kwon K.H.
doaj   +1 more source

On the relation of the frame-related operators of fusion frame systems. [PDF]

Sampl Theory Signal Process Data Anal, 2023
Köhldorfer L, Balazs P.
europepmc   +1 more source

On one non-local problem for axisymmetric Helmholtz equation

Vestnik Samarskogo Gosudarstvennogo Tehničeskogo Universiteta. Seriâ: Fiziko-Matematičeskie Nauki, 2011
Non-local boundary problem for the axisymmetric Helmholtz equation is explored. The uniqueness of the solution is proved by the spectral method. The conditions of solvability are found.
Anton A Abashkin
doaj  

A topology optimization algorithm for magnetic structures based on a hybrid FEM-BEM method utilizing the adjoint approach. [PDF]

Sci Rep, 2022
Wautischer G, Abert C, Bruckner F, Slanovc F, Suess D.   +4 more
europepmc   +1 more source

On sufficient density conditions for lattice orbits of relative discrete series. [PDF]

Arch Math, 2022
Enstad U, van Velthoven JT.
europepmc   +1 more source