scholarly journals A Nonlinear Extension of Korovkin’s Theorem

2020 ◽  
Vol 17 (5) ◽  
Author(s):  
Sorin G. Gal ◽  
Constantin P. Niculescu
Keyword(s):  
Korovkin’S Theorem

The Dunkl generalization of Stancu type q-Szasz-Mirakjan-Kantorovich operators and some approximation results

2018 ◽  
Vol 34 (3) ◽  
pp. 363-370
Author(s):  
M. MURSALEEN ◽  
◽  
MOHD. AHASAN ◽  
Keyword(s):  
Rate Of Convergence ◽  
Modulus Of Continuity ◽  
Exponential Function ◽  
Second Order ◽  
Lipschitz Functions ◽  
Linear Operators ◽  
Positive Linear Operators ◽  
Approximation Properties ◽  
Kantorovich Operators ◽  
Korovkin’S Theorem

In this paper, a Dunkl type generalization of Stancu type q-Szasz-Mirakjan-Kantorovich positive linear operators ´ of the exponential function is introduced. With the help of well-known Korovkin’s theorem, some approximation properties and also the rate of convergence for these operators in terms of the classical and second-order modulus of continuity, Peetre’s K-functional and Lipschitz functions are investigated.

scholarly journals Hermite-Fejér type interpolation and Korovkin's theorem

1990 ◽  
Vol 42 (3) ◽  
pp. 383-390
Author(s):  
H.-B. Knoop ◽  
F. Locher
Keyword(s):  
Uniform Convergence ◽  
Jacobi Polynomials ◽  
Korovkin Theorem ◽  
Type Interpolation ◽  
Special Values ◽  
Convergence Results ◽  
Interpolation Operators ◽  
Positive Functionals ◽  
Interpolation Polynomials ◽  
Korovkin’S Theorem

In this note we consider Hermite-Fejér interpolation at the zeros of Jacobi polynomials and with additional boundary conditions. For the associated Hermite-Fejér type operators and special values of α, β it was proved by the first author in recent papers that one has uniform convergence on the whole interval [−1,1]. The second author could show by introducing the concept of asymptotic positivity how to get the known convergence results for the classical Hermite-Fejér interpolation operators. In the present paper we show, using a slightly modified Bohman-Korovkin theorem for asymptotically positive functionals, that the Hermite-Fejér type interpolation polynomials , converge pointwise to f for arbitrary α, β > −1. The convergence is uniform on [−1 + δ,1 − δ].

scholarly journals Statistical (C,1) (E,1) summability and Korovkin’s theorem

Filomat ◽  
2016 ◽  
Vol 30 (2) ◽  
pp. 387-393 ◽  
Author(s):  
Tuncer Acar ◽  
S.A. Mohiuddine
Keyword(s):  
Korovkin’S Theorem

scholarly journals The degree of approximation by positive operators on compact connected abelian groups

1982 ◽  
Vol 33 (3) ◽  
pp. 364-373 ◽  
Author(s):  
Walter R. Bloom ◽  
Joseph F. Sussich
Keyword(s):  
Rate Of Convergence ◽  
Modulus Of Continuity ◽  
Abelian Groups ◽  
Degree Of Approximation ◽  
Linear Operators ◽  
Test Functions ◽  
Periodic Functions ◽  
Quantitative Version ◽  
Approximation By Positive Operators ◽  
Korovkin’S Theorem

AbstractIn 1953 P. P. Korovkin proved that if (Tn) is a sequence of positive linear operators defined on the space C of continuous real 2 π-periodic functions and lim Tnf = f uniformly for f = 1, cos and sin, then lim Tnf = f uniformly for all f ∈ C. Quantitative versions of this result have been given, where the rate of convergence is given in terms of that of the test functions 1, cos and sin, and the modulus of continuity of f. We extend this result by giving a quantitative version of Korovkin's theorem for compact connected abelian groups.

Approximation by Stancu–Chlodowsky type λ-Bernstein operators

2020 ◽  
Vol 26 (1) ◽  
pp. 97-110
Author(s):  
M. Mursaleen ◽  
A. A. H. Al-Abied ◽  
M. A. Salman
Keyword(s):  
Asymptotic Formula ◽  
Weighted Space ◽  
Direct Result ◽  
Bernstein Operators ◽  
Approximation Properties ◽  
Convergence Properties ◽  
Korovkin’S Theorem

AbstractIn this paper, we give some approximation properties by Stancu–Chlodowsky type λ-Bernstein operators in the polynomial weighted space and obtain the convergence properties of these operators by using Korovkin’s theorem. We also establish the direct result and the Voronovskaja type asymptotic formula.

scholarly journals Approximation by generalized Stancu type integral operators involving Sheffer polynomials

2018 ◽  
Vol 34 (2) ◽  
pp. 215-228
Author(s):  
M. MURSALEEN ◽  
◽  
SHAGUFTA RAHMAN ◽  
KHURSHEED J. ANSARI ◽  
◽  
...  
Keyword(s):  
Modulus Of Continuity ◽  
Integral Operators ◽  
Modulus Of Smoothness ◽  
Approximation Properties ◽  
Convergence Properties ◽  
Weighted Modulus Of Continuity ◽  
Type Integral ◽  
Weighted Modulus ◽  
Sheffer Polynomials ◽  
Korovkin’S Theorem

In this article, we give a generalization of integral operators which involves Sheffer polynomials introduced by Sucu and Buy¨ ukyazici. We obtain approximation properties of our operators with the help of the univer- ¨ sal Korovkin’s theorem and study convergence properties by using modulus of continuity, the second order modulus of smoothness and Peetre’s K-functional. We have also established Voronovskaja type asymptotic formula. Furthermore, we study the convergence of these operators in weighted spaces of functions on the positive semi-axis and estimate the approximation by using weighted modulus of continuity.

Korovkin’s Theorem for Functionals and Limits for Box Integrals

2019 ◽  
Vol 126 (5) ◽  
pp. 449-454
Author(s):  
Gerd Herzog ◽  
Peer Chr. Kunstmann
Keyword(s):  
Korovkin’S Theorem

scholarly journals Approximation by q-analogue of modified Jakimovski-Leviatan-Stancu type operators

2017 ◽  
Vol 50 (1) ◽  
pp. 175-189
Author(s):  
Mohammad Mursaleen ◽  
Mohammad Nasiruzzaman ◽  
Abdul Wafi
Keyword(s):  
Rate Of Convergence ◽  
Modulus Of Continuity ◽  
Lipschitz Class ◽  
Convergence Properties ◽  
Korovkin’S Theorem

Abstract In this paper, we introduce the q-analogue of the Jakimovski-Leviatan type modified operators introduced by Atakut with the help of the q-Appell polynomials.We obtain some approximation results via the well-known Korovkin’s theorem for these operators.We also study convergence properties by using the modulus of continuity and the rate of convergence of the operators for functions belonging to the Lipschitz class. Moreover,we study the rate of convergence in terms of modulus of continuity of these operators in aweighted space.

scholarly journals Convergence of operators and Korovkin's theorem

1968 ◽  
Vol 1 (3) ◽  
pp. 381-390 ◽  
Author(s):  
Daniel E Wulbert
Keyword(s):  
Convergence Of Operators ◽  
Korovkin’S Theorem
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