On equivalence question between the Ditzian-Totik modulus of smoothness and an usual periodic modulus of smoothness.
Properties of the modulus of continuity for monotonous convex functions and applications.
Voronovskaja's theorem and the exact degree of approximation for the derivatives of complex Riesz–Zygmund means.
Obituary: Professor Alexandru Lupas (1942-2007).
On the probabilistic domain invariance.
Geometric and approximation properties of some singular integrals in the unit disk.
Shape-preserving multivariate polynomial approximation in .
The Lower Estimate for Bernstein Operator
MSC 2010: 41A10, 41A15, 41A25, 41A36 For functions belonging to the classes C2[0; 1] and C3[0; 1], we establish the lower estimate with an explicit constant in approximation by Bernstein polynomials in terms of the second order Ditzian-Totik modulus of smoothness. Several applications to some concrete examples of functions are presented.
Approximation and shape preserving properties of the Bernstein operator of max-product kind.
Almost automorphic functions with values in -Fréchet spaces.
On global smoothness preservation in complex approximation
By using the properties of convergence and global smoothness preservation of multivariate Weierstrass singular integrals, we establish multivariate complex Carleman type approximation results with rates. Here the approximants fulfill the global smoothness preservation property. Furthermore Mergelyan's theorem for the unit disc is strengthened by proving the global smoothness preservation property.
Global smoothness preservation by some nonlinear max-product operators
Approximation and shape preserving properties of the nonlinear Bleimann-Butzer-Hahn operators of max-product kind
Starting from the study of the Shepard nonlinear operator of max-prod type in (Bede, Nobuhara et al., 2006, 2008), in the book (Gal, 2008), Open Problem 5.5.4, pp. 324–326, the Bleimann-Butzer-Hahn max-prod type operator is introduced and the question of the approximation order by this operator is raised. In this paper firstly we obtain an upper estimate of the approximation error of the form . A consequence of this result is that for each compact subinterval , with arbitrary , the order of uniform...
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