Stancu modified operators revisited
DOI:
https://doi.org/10.33993/jnaat311-703Keywords:
Kantorovich and Stancu operators, moduli of smoothness, \(K\)-functionals, contraction principle, weakly Picard operatorsAbstract
In this paper we construct a general positive approximation process representing an integral form in Kantorovich sense of the Stancu operators. By using K-functionals and some moduli of smoothness we give direct theorems for pointwise approximation. Also, by using the contraction principle we reobtain the convergence of the iterates of Stancu polynomials.Downloads
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Agratini, O., On some properties by Stancu-Kantorovich polynomials in L_{p} spaces, in: Seminar of Numerical and Statistical Calculus (Gh. Coman, ed.), pp. 1-8, Babeş-Bolyai Univ., Faculty of Math. and Computer Science, Cluj-Napoca, 1999.
Altomare, F., and Campiti, M., Korovkin-Type Approximation Theory and its Applications, De Gruyter Series Studies in Mathematics, 17, Walter de Gruyter, Berlin, 1994. DOI: https://doi.org/10.1515/9783110884586
Della Vecchia, B. and Mache, D.H., On approximation properties of Stancu-Kantorovich operators, Rev. Anal. Numér. Théor. Approx., 27, no. 1, pp. 71-80, 1998, http://ictp.acad.ro/jnaat/journal/article/view/1998-vol27-no1-art8
Ditzian, Z., and Totik, V., Moduli of Smoothness, Springer Series in Computational Mathematics, 9, Springer-Verlag, New York-Berlin, 1987. DOI: https://doi.org/10.1007/978-1-4612-4778-4
Guo, S., Liu, L., and X. Liu, The pointwise estimate for modified Bernstein operators, Studia Sci. Math. Hungarica, 37, pp. 69-81, 2001. DOI: https://doi.org/10.1556/sscmath.37.2001.1-2.4
Lenze, B., On Lipschitz-type maximal functions and their smoothness spaces, Proc. Netherl. Acad. Sci. A, 91, pp. 53-63, 1988, https://doi.org/10.1016/1385-7258(88)90007-8. DOI: https://doi.org/10.1016/1385-7258(88)90007-8
Mastroianni, G. and Occorsio, M.R., Una generalizatione dell'operatore di Stancu, Rend. Accad. Sci. Fis. Mat. Napoli, 45, no. 4, pp. 495-511, 1978.
Q. Razi, Approximation of a function by Kantorovich type operators, Matematički Vesnik, 41, pp. 183-192, 1989.
Rus, I.A., Iterates of Bernstein operators, via contraction principle, J. Math. Anal. Appl. (submitted), https://doi.org/10.1016/j.jmaa.2003.11.056. DOI: https://doi.org/10.1016/j.jmaa.2003.11.056
Stancu, D.D., Approximation of functions by a new class of linear polynomial operators, Rev. Roum. Math. Pures et Appl., 13, no. 8, pp. 1173-1194, 1968.
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