Results 21 to 30 of about 742,712 (288)

Unbounded rational systems with nonconstant coefficients

Nonautonomous Dynamical Systems, 2022
Abstract We show the existence of unbounded solutions to difference equations of the form {
Kudlak Zachary, Vernon R. Patrick
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Damped nonlinear Ginzburg-Landau equation with saturation. Part I. Existence of solutions on general domains [PDF]

Opuscula Mathematica
We study the complex Ginzburg-Landau equation posed on possibly unbounded domains, including some singular and saturated nonlinear damping terms. This model interpolates between the nonlinear Schrödinger equation and dissipative parabolic dynamics ...
Pascal Bégout, Jesús Ildefonso Díaz
doaj   +1 more source

Absolute Stability Criteria for Large-Scale Lurie Direct Control Systems with Time-Varying Coefficients

The Scientific World Journal, 2014
The absolute stability of large-scale Lurie direct control systems with time-varying coefficients is investigated. Based on the decomposition method for large-scale systems and technique of the nonsingular M-matrix, a suitable scalar Lyapunov function as
Fucheng Liao, Di Wang
doaj   +1 more source

Conditions of coercive solvability of third-order differential equation with unbounded intermediate coefficients

Қарағанды университетінің хабаршысы. Математика сериясы, 2019
In this paper we study the following equation - y ''' + r ( x ) y '' + q ( x ) y ' + s ( x ) y = f ( x ) , where the intermediate coefficients r and q do not depend on s .
K.N. Ospanov, Zh.B. Yeskabylova
doaj   +1 more source

Measures for orthogonal polynomials with unbounded recurrence coefficients

Journal of Approximation Theory, 2016
Systems of orthogonal polynomials whose recurrence coefficients tend to infinity are considered. A summability condition is imposed on the coefficients and the consequences for the measure of orthogonality are discussed. Also discussed are asymptotics for the polynomials.
Alexander I. Aptekarev, Jeffrey S. Geronimo   +1 more
openaire   +2 more sources

A Note on Some Properties of Unbounded Bilinear Forms Associated with Skew-Symmetric $L^q(\Omega)$-Matrices

Researches in Mathematics
We study the bilinear forms on the space of measurable $p$-integrable functions which are generated by skew-symmetric matrices with unbounded coefficients.
P.I. Kogut
doaj   +1 more source

An Lp-Estimate for Weak Solutions of Elliptic Equations

Abstract and Applied Analysis, 2012
We prove an Lp-a priori bound, p>2, for solutions of second order linear elliptic partial differential equations in divergence form with discontinuous coefficients in unbounded domains.
Sara Monsurrò, Maria Transirico
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Some Fourier inequalities for orthogonal systems in Lorentz–Zygmund spaces

Journal of Inequalities and Applications, 2019
A number of classical inequalities and convergence results related to Fourier coefficients with respect to unbounded orthogonal systems are generalized and complemented. All results are given in the case of Lorentz–Zygmund spaces.
G. Akishev, L. E. Persson, A. Seger
doaj   +1 more source

On coupled systems of PDEs with unbounded coefficients [PDF]

Dynamics of Partial Differential Equations, 2020
We study the Cauchy problem associated to parabolic systems of the form $D_t\boldsymbol{u}=\boldsymbol{\mathcal A}(t)\boldsymbol u$ in $C_b(\mathbb{R}^d;\mathbb{R}^m)$, the space of continuous and bounded functions $\boldsymbol{f}:\mathbb{R}^d\to\mathbb{R}^m$.
Angiuli L., Lorenzi L.
openaire   +5 more sources

Derivation of ensemble Kalman-Bucy filters with unbounded nonlinear coefficients

, 2022
Lange T. Derivation of ensemble Kalman-Bucy filters with unbounded nonlinear coefficients. Nonlinearity . 2022;35(2):1061-1092.We provide a rigorous derivation of the ensemble Kalman-Bucy filter as well as the ensemble transform Kalman-Bucy filter in ...
Lange, Theresa
core   +1 more source