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- Octavian Agratini
- Int. J. Math. Mathematical Sciences
- 2006

The paper centers around a pair of sequences of linear positive operators. The former has the degree of exactness one and the latter has its degree of exactness null, but, as a novelty, it reproduces the third test function of Korovkin theorem. Quantitative estimates of the rate of convergence are given in different function spaces traveling from classical… (More)

The concern of this note is to introduce a general class of linear positive operators of discrete type acting on the space of real valued functions defined on a plane domain. These operators preserve some test functions of Bohman-Korovkin theorem. Following our technique, as a particular class, a modified variant of the bivariate Bernstein-Chlodovsky… (More)

- Octavian Agratini
- Computers & Mathematics with Applications
- 2008

This note is focused upon positive linear operators which preserve the quadratic test function. By using contraction principle, we study the convergence of their iterates. c © 2007 Elsevier Ltd. All rights reserved.

In this paper we are concerned with a general class of positive linear operators of discrete type. Based on the results of the weakly Picard operators theory our aim is to study the convergence of the iterates of the defined operators and some approximation properties of our class as well. Some special cases in connection with binomial type operators are… (More)

and Applied Analysis 3 For each (m, n) ∈ N × N and any f ∈ C p,q (R2 + ) we define the linear positive operators

- Octavian Agratini, Grzegorz Nowak
- Mathematical and Computer Modelling
- 2011

- Ants Aasma, Fahreddin G. Abdullayev, Octavian Agratini, E. W. Cheney, A. Sharma, D. D. Stancu
- 2016

Approximation in Banach Spaces by Summation Methods of Fourier Expansions Ants Aasma Tallinn Technical University, Tallinn, Estonia Let X be a Banach space, where exists a total sequence of mutually orthogonal continuous projections (Tk) on X. Then with each x ∈ X we can associate its formal Fourier expansion x ∼ ∑ k Tkx. Let Z (r > 0) be the Zygmund… (More)

- OCTAVIAN AGRATINI, PETRU BLAGA, +18 authors Alexandra Oprişan
- 2002

Gheorghe Coman was born on January 24th 1936, in Grindeni, Mureş. He attended elementary school (1944-1948) in his home-village, secondary school (19481951) in the town of Luduş and high-school (1951-1956) in Cluj, a rich cultural and historical city located on the Someş river banks. From 1956 to 1961 he was a student at the Faculty of Mathematics and… (More)

- Octavian Agratini
- Appl. Math. Lett.
- 2006

- Ulrich Abel, Octavian Agratini
- Numerical Algorithms
- 2015

The topic of the present paper are certain approximation operators acting on the space of continous functions on [0,+∞) having polynomial growth. The operators which were defined by Jain in 1972 are based on a probability distribution which is called generalized Poisson distribution. As a main result we derive a complete asymptotic expansion for the… (More)