For linear combinations of Bernstein-Kantorovich operators K n r f x , we give an equivalent theorem with Ο 2r Ο Ξ» f t . The theorem unites the corresponding results of classical and Ditzian-Totik moduli of smoothness.
Pointwise Approximation for Linear Combinations of Bernstein Operators
β Scribed by Shunsheng Guo; Cuixiang Li; Xiwu Liu; Zhanjie Song
- Publisher
- Elsevier Science
- Year
- 2000
- Tongue
- English
- Weight
- 140 KB
- Volume
- 107
- Category
- Article
- ISSN
- 0021-9045
No coin nor oath required. For personal study only.
π SIMILAR VOLUMES
We give necessary and sufficient conditions such that iterates or certain linear combinations of iterates of linear operators of finite dimensional range, respectively, converge. In case of convergence, we give an expression for the limit as well as estimates for the rate of convergence. Our results
Let L be the LAME operator defined by Lu = n u + p grad div u ( p > 0, u = = (ul, u,, u ~) ~) . We denote the fundamental solution of L by E = (Eij)i<j= 1,2,3. By Ei = (Eli, E,,, E3i)T(i = 1, 2, 3) we denote the column vectors of E. Let r be the Cm-smooth boundary of a bounded domain 52 c R3 with c
## Abstract A unified class of linear positive operators has been defined. Using these operators some approximation estimates have been obtained for unbounded functions. For particular linear positive operators these results sharpen and improve the earlier estimates due to Fuhua Cheng (J. Approx. T