ABSTRACT
This paper is interested in a new sequence of linear positive operators including degenerate Appell polynomials. We give a convergence theorem for these operators and obtain the quantitative estimation of the approximation by using modulus of continuity, Peetre’s 𝒦-functional, Lipschitz class functions and a Voronovskaja-type theorem. In addition, we give a Kantorovich modification of these operators and derive some approximation properties.
The authors would like to thank the editor and referee for their valuable comments which greatly helped improving the clarity and quality of the paper. In addition, they also would like to thank the Scientific and Technological Research Council of Turkey (TÜBİTAK) for the graduate scholarship that supported the first author.
REFERENCES
[1] Altomare, F.—Campiti, M.: Korovkin-type Approximation Theory and its Applications, De Gruyter Stud. Math., Berlin, 1994.10.1515/9783110884586Search in Google Scholar
[2] Appell, P. E.: Sur une classe de polynômes, Ann. Sci. École Norm Sup. 9 (1880), 119–144.10.24033/asens.186Search in Google Scholar
[3] Atakut, Ç.—Büyükyazici, İ.: Approximation by modified integral type Jakimovski-Leviatan operators, Filomat 30(1) (2016), 29–39.10.2298/FIL1601029CSearch in Google Scholar
[4] Banach, S.: Théorie des Opérations Linéaires. Monografie Matematyczne, 1932 (in French).Search in Google Scholar
[5] Bateman, H.—Erdélyi, A.: Higher Transcendental Functions 1–3, McGraw-Hill, 1953–1955.Search in Google Scholar
[6] Boas, R. P.—Buck, R. C.: Polynomial Expansions of Analytic Functions, Springer & Acad. Press, Canada, 1958.10.1007/978-3-642-87887-9Search in Google Scholar
[7] Bourbaki, N.: Elements of Mathematics. Functions of a Real Variable, Addison-Wesley, 1976.Search in Google Scholar
[8] Cai, Q. B.—Çekim, B.—İçöz, G.: Gamma generalization operators involving analytic functions, Mathematics 9(13) (2021), Art. No. 1547.10.3390/math9131547Search in Google Scholar
[9] Carlitz, L.: A degenerate Staudt-Clausen theorem, Arch. Math. (Basel) 7 (1956), 28–33.10.1007/BF01900520Search in Google Scholar
[10] Chihara, T. S.: An Introduction to Orthogonal Polynomials, Gordon and Breach, New York, 1978.Search in Google Scholar
[11] Ciupa, A.: A class of integral Favard-Szász type operators, Studia Univ. Babeş-Bolyai Math. 40(1) (1995), 39–47.Search in Google Scholar
[12] Costabile, F. A.—Longo, E.: Δh-Appell sequences and related interpolation problem, Numer. Algor. 63 (2013), 165–186.10.1007/s11075-012-9619-1Search in Google Scholar
[13] Devore, R. A.—Lorentz, G. G.: Constructive Approximation, Springer-Verlag, Berlin, 1993.10.1007/978-3-662-02888-9Search in Google Scholar
[14] İçöz, G.—Varma, S.—Sucu, S.: Approximation by operators including generalized Appell polynomials, Filomat 30(2) (2016), 429–440.10.2298/FIL1602429ISearch in Google Scholar
[15] Ismail, M. E.: Classical and Quantum Orthogonal Polynomials in One Variable, Cambridge Univ. Press, 2005.10.1017/CBO9781107325982Search in Google Scholar
[16] Jakimovski, A.—Leviatan, D.: Generalized Szász operators for the approximation in the infinite interval, Mathematica (Cluj) 11(34) (1969), 97–103.Search in Google Scholar
[17] Kantorovich, L. V.: Sur certains developpments suivant les polynômes de la forme de S. Bernstein I, II, Dokl. Akad. Nauk. SSSR (1930), 563–568, 595–600.Search in Google Scholar
[18] Lebesgue, H.: Sur les intégrales singulières, Ann. Fac. Sci. Univ. Toulouse 3 (1909), 25–117.10.5802/afst.257Search in Google Scholar
[19] özarslan, M. A.—Yilmaz Yaşar, B.: Δh-Gould-Hopper Appell polynomials, Acta Math. Sci. 41B(4) (2021), 1196–1222.10.1007/s10473-021-0411-ySearch in Google Scholar
[20] Prakash, C.—Verma, D. K.—Deo, N.: Approximation by a new sequence of operators involving Apostol-Genocchi polynomials, Math. Slovaca 71 (2021), 1179–1188.10.1515/ms-2021-0047Search in Google Scholar
[21] Sucu, S.—İçöz, G.—Varma, S.: On some extensions of Szász operators including Boas-Buck-type polynomials, Abstr. Appl. Anal. 2012 (2012), Art. ID 680340.10.1155/2012/680340Search in Google Scholar
[22] Sucu, S.—Varma, S.: Approximation by sequence of operators involving analytic functions, Mathematics 7 (2019), Art. No. 188.10.3390/math7020188Search in Google Scholar
[23] Szász, O.: Generalization of Bernstein’s polynomials to the infinite interval, J. Res. Natl. Bur. Stand. 45(3) (1950), 239–245.10.6028/jres.045.024Search in Google Scholar
[24] Szegö, G.: Orthogonal Polynomials, Amer. Math. Soc., 1975.Search in Google Scholar
[25] Varma, S.—Sucu, S.—İçöz, G.: Generalization of Szász operators involving Brenke type polynomials, Comput. Math. Appl. 64(2) (2012), 121–127.10.1016/j.camwa.2012.01.025Search in Google Scholar
[26] Wood, B.: Generalized Szász operators for the approximation in the complex domain, SIAM J. Appl. Math. 17 (1969), 790–801.10.1137/0117071Search in Google Scholar
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