TAILIEUCHUNG - Báo cáo hóa học: " Research Article Rate of Convergence of a New Type Kantorovich Variant of Bleimann-Butzer-Hahn Operators"

Research Article Rate of Convergence of a New Type Kantorovich Variant of Bleimann-Butzer-Hahn Operators | Hindawi Publishing Corporation Journal of Inequalities and Applications Volume 2009 Article ID 852897 10 pages doi 2009 852897 Research Article Rate of Convergence of a New Type Kantorovich Variant of Bleimann-Butzer-Hahn Operators Lingju Chen1 and Xiao-Ming Zeng2 1 Department of Mathematics Minjiang University Fuzhou 350108 China 2 Department of Mathematics Xiamen University Xiamen 361005 China Correspondence should be addressed to Lingju Chen lingjuchen@ and Xiao-Ming Zeng xmzeng@ Received 28 September 2009 Accepted 16 November 2009 Recommended by Vijay Gupta A new type Kantorovich variant of Bleimann-Butzer-Hahn operator Jn is introduced. Furthermore the approximation properties of the operators Jn are studied. An estimate on the rate of convergence of the operators Jn for functions of bounded variation is obtained. Copyright 2009 L. Chen and . Zeng. This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use distribution and reproduction in any medium provided the original work is properly cited. 1. Introduction In 1980 Bleimann et al. 1 introduced a sequence of positive linear Bernstein-type operators Ln abbreviated in the following by BBH operators defined on the infinite interval I 0 to by Lf 1 ni x k Ỵ x e I n e N 1 xf k n 1 - kf where N denotes the set of natural numbers. Bleimann et al. 1 proved that Ln f x f x as n to for f e Cb I the space of all bounded continuous functions on I and give an estimate on the rate of convergence of Ln f x f x measured with the second modulus of continuity of f. In the present paper we introduce a new type of Kantorovich variant of BBH operator Jn also defined on I by n f k 0 yp 1 - Px r-k k hkf h dt ÍIkdt 2 Journal of Inequalities and Applications where px x 1 x x 0 Ik k n 2 - k k 1 n 1 - k and dt is Lebesgue measure. The operator is different from another type of Kantorovich variant of BBH operator Kn Kf n Zn r k 1 n 1-k

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