scholarly journals Sheffer polynomials and approximation operators

2003 ◽  
Vol 34 (2) ◽  
pp. 117-128
Author(s):  
Emil C. Popa
Keyword(s):  
Uniform Convergence ◽  
Positive Operators ◽  
Convergence Criterion ◽  
Identity Operator ◽  
Linear Positive Operators ◽  
Approximation Operators ◽  
Sheffer Polynomials

In this paper we are studying the sequence of linear positive operators $(P_n^{(Q,S)})$ defined in (2). Using the Bohman-Korovkin uniform convergence criterion we are proving that the sequence $(P_n^{(Q,S)})$ converges uniformly to the identity operator. noindent In addition we give some estimates. Finally we consider two examples $(P_n^{(A,S)})$ and $(P_n^{(na,S)})$ defined in (25), (27).

scholarly journals On the uniform convergence of a q-series

2016 ◽  
Vol 32 (2) ◽  
pp. 141-146
Author(s):  
OCTAVIAN AGRATINI ◽  
◽  
VIJAY GUPTA ◽  
Keyword(s):  
Uniform Convergence ◽  
Upper Bound ◽  
Uniform Approximation ◽  
Approximation Error ◽  
Modulus Of Smoothness ◽  
Positive Operators ◽  
Linear Positive Operators

The paper deals with a class of linear positive operators expressed by q-series. By using modulus of smoothness an upper bound of approximation error is determined. We identify functions for which these operators provide uniform approximation over noncompact intervals. A particular case is delivered.

On the approximation of convex functions using linear positive operators

2017 ◽  
Vol 26 (2) ◽  
pp. 137-143
Author(s):  
DAN BARBOSU
Keyword(s):  
Convex Functions ◽  
Remainder Term ◽  
Mean Value ◽  
Positive Operators ◽  
Linear Functionals ◽  
Linear Positive Operators ◽  
Famous Theorem ◽  
Approximation Formulas ◽  
Phd Thesis ◽  
Higher Order Convexity

The goal of the paper is to present some results concerning the approximation of convex functions by linear positive operators. First, one recalls some results concerning the univariate real valued convex functions. Next, one presents the notion of higher order convexity introduced by Popoviciu [Popoviciu, T., Sur quelques propri´et´ees des fonctions d’une ou deux variable r´eelles, PhD Thesis, La Faculte des Sciences de Paris, 1933 (June)] . The Popoviciu’s famous theorem for the representation of linear functionals associated to convex functions of m−th order (with the proof of author) is also presented. Finally, applications of the convexity to study the monotonicity of sequences of some linear positive operators and also mean value theorems for the remainder term of some approximation formulas based on linear positive operators are presented.

Inverse theorems for some linear positive operators using Beta and Baskakov basis functions

2021 ◽  
Author(s):  
Lakshmi Narayan Mishra ◽  
A. Srivastava ◽  
T. Khan ◽  
S. A. Khan ◽  
Vishnu Narayan Mishra
Keyword(s):  
Positive Operators ◽  
Basis Functions ◽  
Linear Positive Operators ◽  
Inverse Theorems

Iterative combinations for Srivastava–Gupta operators

2020 ◽  
pp. 2150108
Author(s):  
Prerna Maheshwari Sharma
Keyword(s):  
Rate Of Convergence ◽  
Modulus Of Continuity ◽  
Simultaneous Approximation ◽  
Higher Order ◽  
Positive Operators ◽  
Integral Type ◽  
Linear Positive Operators ◽  
General Family ◽  
Special Cases

In the year 2003, Srivastava–Gupta proposed a general family of linear positive operators, having some well-known operators as special cases. They investigated and established the rate of convergence of these operators for bounded variations. In the last decade for modified form of Srivastava–Gupta operators, several other generalizations also have been discussed. In this paper, we discuss the generalized modified Srivastava–Gupta operators considered in [H. M. Srivastava and V. Gupta, A certain family of summation-integral type operators, Math. Comput. Modelling 37(12–13) (2003) 1307–1315], by using iterative combinations in ordinary and simultaneous approximation. We may have better approximation in higher order of modulus of continuity for these operators.

scholarly journals TheΘ-transformation of certain positive linear operators

1996 ◽  
Vol 19 (4) ◽  
pp. 667-678 ◽  
Author(s):  
Aleandru Lupaş ◽  
Detlef H. Mache
Keyword(s):  
Construction Method ◽  
Positive Operators ◽  
Linear Operators ◽  
Positive Linear Operators ◽  
Order Of Approximation ◽  
Linear Positive Operators

The intention of this paper is to describe a construction method for a new sequence of linear positive operators, which enables us to get a pointwise order of approximation regarding the polynomial summator operators which have “best” properties of approximation.

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