Factoring linear differential operators on measure chains.
Factorization of rational matrix functions and difference equations
In the beginning of the twentieth century, Plemelj introduced the notion of factorization of matrix functions. The matrix factorization finds applications in many fields such as in the diffraction theory, in the theory of differential equations and in the theory of singular integral operators. However, the explicit formulas for the factors of the factorization are known only in a few classes of matrices. In the present paper we consider a new approach to obtain the factorization of a rational matrix...
Factorization of the hypergeometric-type difference equation on the uniform lattice.
Familles fuchsiennes d’équations aux (-)différences et confluence
On commence par présenter une méthode de résolution d’une famille de systèmes fuchsiens d’opérateurs de pseudo-dérivations associées à une famille à deux paramètres d’homographies, qui unifie et généralise les cas connus des systèmes différentiels, aux différences ou aux -différences. Nous traitons ensuite dans cette famille des problèmes de confluence que l’on peut voir comme des problèmes de continuité en ces deux paramètres.
Finite difference schemes with monotone operators.
First- and second-order dynamic equations with impulse.
Fixed points of meromorphic functions and of their differences and shifts
Let f(z) be a finite order transcendental meromorphic function such that λ(1/f(z)) < σ(f(z)), and let c ∈ ℂ∖0 be a constant such that f(z+c) ≢ f(z) + c. We mainly prove that , where τ(g(z)) denotes the exponent of convergence of fixed points of the meromorphic function g(z), and σ(g(z)) denotes the order of growth of g(z).
Forced oscillation of third order nonlinear dynamic equations on time scales
Consider the third order nonlinear dynamic equation , (*) on a time scale which is unbounded above. The function f ∈ C(,) is assumed to satisfy xf(x) > 0 for x ≠ 0 and be nondecreasing. We study the oscillatory behaviour of solutions of (*). As an application, we find that the nonlinear difference equation , where α ≥ -1, γ > 0, c > 3, is oscillatory.
Forme normale d'Arnold et réduction formelle des systèmes d'équations linéaires aux différences.
Four different unknown functions satisfying the triangle mean value property for harmonic polynomials, II
Fredholm determinants and the Evans function for difference equations
We develop a difference equations analogue of recent results by F. Gesztesy, K. A. Makarov, and the second author relating the Evans function and Fredholm determinants of operators with semi-separable kernels.
Fredholm type integrodifferential equation on time scales.
Frequent oscillation in a nonlinear partial difference equation
This paper is concerned with a class of nonlinear delay partial difference equations with variable coefficients, which may change sign. By making use of frequency measures, some new oscillatory criteria are established. This is the first time oscillation of these partial difference equations is discussed by employing frequency measures.
Frequent oscillation of a class of partial difference equations.
Function bounds for solutions of Volterra integro dynamic equations on time scales.
Functional equations stemming from numerical analysis [Book]
Functional equations which caracterize n-forms and homogeneous functions of degree n. (Short Communication).
Functionals on sequence spaces connected with the exponential stability of evolutionary processes.
Functions satisfying a discrete mean value property.
Functions With Asymptotically Infinite Differences