Results 21 to 30 of about 274 (53)

On Popoviciu-Ionescu functional equation

, 2016
We study a functional equation first proposed by T. Popoviciu in 1955. It was solved for the easiest case by Ionescu in 1956 and, for the general case, by Ghiorcoiasiu and Roscau, and Rad\'o in 1962.
Almira, J. M.
core   +2 more sources

Reconstructing Jacobi Matrices from Three Spectra

, 2002
Cut a Jacobi matrix into two pieces by removing the n-th column and n-th row. We give neccessary and sufficient conditions for the spectra of the original matrix plus the spectra of the two submatrices to uniqely determine the original matrix. Our result
B Simon, F Gesztesy, F Gesztesy, G Teschl, G Teschl, GML Gladwell, H Hochstadt, R Hryniv, V Pivovarchik   +8 more
core   +2 more sources

Stability for the inverse resonance problem for the CMV operator

, 2013
For the class of unitary CMV operators with super-exponentially decaying Verblunsky coefficients we give a new proof of the inverse resonance problem of reconstructing the operator from its resonances - the zeros of the Jost function.
Shterenberg, Roman, Weikard, Rudi, Zinchenko, Maxim   +2 more
core   +1 more source

Discrete double-porosity models for spin systems

, 2015
We consider spin systems between a finite number $N$ of "species" or "phases" partitioning a cubic lattice $\mathbb{Z}^d$. We suppose that interactions between points of the same phase are coercive, while between point of different phases (or, possibly ...
Andrea, Braides, Margherita, Solci, Valeria, Chiadò Piat   +2 more
core   +1 more source

Laplace - Fibonacci transform by the solution of second order generalized difference equation

Nonautonomous Dynamical Systems, 2017
The main objective of this paper is finding new types of discrete transforms with tuning factor t. This is not only analogy to the continuous Laplace transform but gives discrete Laplace-Fibonacci transform (LFt). This type of Laplace-Fibonacci transform
Pinelas Sandra, Xavier G. B. A., Kumar S. U. Vasantha, Meganathan M.   +3 more
doaj   +1 more source

Existence and uniqueness of positive solution for nonlinear difference equations involving p(k)-Laplacian operator

Analele Stiintifice ale Universitatii Ovidius Constanta: Seria Matematica, 2019
In this paper, we deal with the existence of at least one and of at least two positive solutions as well the uniqueness of a positive solution for an anisotropic discrete non-linear problem involving p(k)-Laplacian with Dirichlet boundary value ...
Moghadam Mohsen Khaleghi, Wieteska Renata   +1 more
doaj   +1 more source

Relative Uniform Convergence of Quantum Difference Sequence of Functions Related to ℓp-Space Defined by Orlicz Function

Annales Mathematicae Silesianae
The sequence spaces ruℓ∞(𝒪, ∇q), ruℓp(𝒪, ∇q), ruc(𝒪, ∇q), ruc0(𝒪, ∇q), rumϕ(𝒪, ∇q, p), runϕ(𝒪, ∇q, p), rumϕ(𝒪, ∇q), runϕ(𝒪, ∇q) are defined by the Orlicz function in this article.
Debbarma Diksha, Tripathy Binod Chandra
doaj   +1 more source

Characterization of Classes of Polynomial Functions

, 2014
In this paper some classes of local polynomial functions on abelian groups are characterized by the properties of their variety. For this characterization we introduce a numerical quantity depending on the variety of the local polynomial only.
Almira, J. M., Székelyhidi, L.
core   +1 more source

A generalization of starlike functions of order alpha [PDF]

, 2015
For every $q\in(0,1)$ and $0\le ...
Agrawal, Sarita, Sahoo, Swadesh K.
core  

On Fourier integral transforms for $q$-Fibonacci and $q$-Lucas polynomials

, 2012
We study in detail two families of $q$-Fibonacci polynomials and $q$-Lucas polynomials, which are defined by non-conventional three-term recurrences.
Andrews G E, Askey R, Atakishiyev N M, Bers L, Cigler J, Cigler J, Cigler J, Dahlquist G, Decio Levi, Dunlap R A, Ismail M E H, Lang W, Maroni P, Matveev V B, Natig Atakishiyev, Orlando Ragnisco, Pedro Franco, Schroeder M, Slater L J   +18 more
core   +1 more source