Abstract
The present paper deals with modifications of Bernstein, Kantorovich, Durrmeyer and genuine Bernstein–Durrmeyer operators. Some previous results are improved in this study. Direct estimates for these operators by means of the first and second modulus of continuity are given. Also the asymptotic formulas for the new operators are proved.
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References
Acu, A.M., Acar, T., Muraru, C.V., Radu, V.A.: Some approximation properties by a class of bivariate operators. Math. Methods Appl. Sci. 42, 5551–5565 (2019)
Acu, A.M., Bascanbaz-Tunca, G., Cetin, N.: Approximation by certain linking operators. Ann. Funct. Anal. 11, 1184–1202 (2020)
Acu, A.M., Gonska, H.: Classical Kantorovich operators revisited. Ukr. Math. J. 71, 843–852 (2019)
Acu, A.M., Agrawal, P.: Better approximation of functions by genuine Bernstein–Durrmeyer type operators. Carpathian J. Math. 35(2), 125–136 (2019)
Acu, A.M., Gupta, V., Tachev, G.: Better numerical approximation by Durrmeyer type operators. Results Math. 74, 90 (2019)
Acu, A.M., Gupta, V., Tachev, G.: Modified Kantorovich operators with better approximation properties. Numer. Algorithms 81, 125–149 (2019)
Acu, A.M., Rasa, I.: New estimates for the differences of positive linear operators. Numer. Algorithms 73(3), 775–789 (2016)
Chen, W.: On the modified Durrmeyer–Bernstein operator (in handwritten Chinese). Report of the fifth chinese conference on approximation theory, Zhen Zhou, China (1987)
Durrmeyer, J.L.: Une formule d’inversion de la transformé de Laplace: Applications à la théorie des moments. Thèse de 3e cycle, Paris (1967)
Gavrea, I., Opris, A.A.: Modified Kantorovich–Stancu operators (II). Stud. Univ. Babes-Bolyai Math. 64(2), 197–205 (2019)
Gonska, H.: Two problems on best constants in direct estimates. In: Ditzian, Z et al. (eds.) Problem section of proc. Edmonton conf. approximation theory, vol. 194. American Mathematical Society, Providence, RI (1983)
Gonska, H., Lupaş, A.: On an algorithm for Bernstein polynomials. In: Lyche, T., Mazure, M.-L., Schumaker, L. (eds.) Curve and Surface Design: Saint Malo, pp. 197–203. Nashboro Press, Brentwood (2002)
Gonska, H., Heilmann, M., Raşa, I.: Kantorovich operators of order k. Numer. Funct. Anal. Optim. 32(7), 717–738 (2011)
Gonska, H.: Quantitative Korovkin-type theorems on simultaneous approximation. Math. Z. 186, 419–433 (1984)
Gonska, H., Raşa, I.: A Voronovskaja estimate with second order of smoothness. In: Dumitru, A. et al. (ed) Proceedings of the 5th International Symposium “Mathematical Inequalities”, Sibiu, Romania, September 25–27, 2008, Sibiu, “Lucian Blaga” University Press. ISBN 978-973-739-740-9, pp. 76–90 (2008)
Goodman, T.N.T., Sharma, A.: A modified Bernstein–Schoenberg operator. In: Sendov, B. et al. Proceedings of the Conference on Constructive Theory of Functions, Varna 1987 (pp. 166–173). Publ. House Bulg. Acad. of Sci., Sofia (1988)
Kacsó, D.: Certain Bernstein–Durrmeyer type operators preserving linear functions. Habilitation Thesis, Duisburg-Essen University (2007)
Kantorovich, L.V.: Sur certains developpements suivant les polynômes de la forme de S. Bernstein I, II, Dokl. Akad. Nauk. SSSR , pp. 563–568, 595–600 (1930)
Khosravian-Arab, H., Dehghan, M., Eslahchi, M.R.: A new approach to improve the order of approximation of the Bernstein operators: theory and applications. Numer. Algorithms 77(1), 111–150 (2018)
Lupaş, A.: Die Folge der Betaoperatoren. Dissertation, Universität Stuttgart (1972)
Opriş, A.A.: Approximation by modified Kantorovich–Stancu operators. J. Inequalities Appl. 2018, 346 (2018)
Păltănea, R.: Approximation Theory Using Positive Linear Operators. Birkhäuser, Boston (2004)
Zygmund, A.: Smooth functions. Duke Math. J. 12, 47–76 (1945)
Acknowledgements
The first author acknowledges the support of Lucian Blaga University of Sibiu under research Grant LBUS-IRG-2020-06. The second one is grateful for the departmental facilities provided during his senior professorship at the University of Duisburg-Essen.
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Acu, AM., Gonska, H. Perturbed Bernstein-type operators. Anal.Math.Phys. 10, 49 (2020). https://doi.org/10.1007/s13324-020-00389-w
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DOI: https://doi.org/10.1007/s13324-020-00389-w
Keywords
- Approximation by polynomials
- Bernstein operators
- Kantorovich operators
- Durrmeyer operators
- Voronovskaya type theorem
- First and second order moduli