almost convergence through the generalized de la vallée-poussin mean

Polynomial approximation on spheres - generalizing de la Vallée-Poussin

For trigonometric polynomial approximation on a circle, the de la Vallée Poussin construction has two notable properties as the polynomial degree goes to infinity: it yields uniform convergence for all continuous functions; yet it also exhibits arbitrarily fast convergence for smooth functions. It is allowed to have both properties because it is a uniformly bounded but not positive projection o...

Generalized De La Vallée Poussin Operators for Jacobi Weights

Starting from a natural generalization of the trigonometric case, we construct a de la Vallée Poussin approximation process in the uniform and L norms. With respect to the classical approach we obtain the convergence for a wider class of Jacobi weights. Even if we only consider the Jacobi case, our construction is very general and can be extended to other classes of weights.

A numerical method for the generalized airfoil equation based on the de la Vallée Poussin interpolation

The authors consider the generalized airfoil equation in some weighted Hölder–Zygmund spaces with uniform norms. Using a projection method based on the de la Vallée Poussin interpolation, they find an approximate polynomial solution which converges to the original solution like the best uniform weighted polynomial approximation. The proposed numerical procedure leads to solve a tridiagonal line...

Formes hémorragiques graves de la fièvre de la vallée du Rift: à propos de 5 cas

Résumé La fièvre de la vallée du Rift (FVR) est une arbovirose due à un virus à ARN appartenant à la famille de Bunyaviridae (genre phlebovirus). C’est une zoonose touchant principalement les animaux mais pouvant aussi contaminer l'homme, soit directement par la manipulation des viandes ou avortons d’animaux malades ou indirectement par la piqure de moustiques infectées (Aèdes sp, anophèles sp,...

Almost convergence and generalized difference matrix

Let f denotes the space of almost convergent sequences, and f̂ also be the domain of the generalized di erence matrix B(r, s) in the sequence space f . The present paper is devoted to studing on the sequence spaces f̂ and f̂ s. Furthermore, the βand γ-duals of the space f̂ are determined. Finally, the classes (f̂ : μ) and (μ : f̂) of in nite matrices are characterized and the characterizations of som...

Etude sur la digestion pancratique de la caseine pour la production de la toxine tetanique