Szasz-Mirakjan型算子的导数与函数的光滑性 |
| |
引用本文: | 熊静宜,杨汝月,曹飞龙. Szasz-Mirakjan型算子的导数与函数的光滑性[J]. 海南大学学报(自然科学版), 2003, 21(3) |
| |
作者姓名: | 熊静宜 杨汝月 曹飞龙 |
| |
作者单位: | 1. 中国计量学院,数学系,浙江,杭州,310034 2. 绍兴文理学院,数学系,浙江,绍兴,312000 |
| |
摘 要: | 利用r阶Ditzian-Totik模ωrφλ(f,t)(r∈N,0≤λ≤1),得到关于Szasz-Mirakjan型算子导数的特征刻画定理,建立了算子导数与函数光滑性之间的点态及整体关系,并统一了这2种结果.
|
关 键 词: | Szasz-Mirakjan型算子 同时逼近 正定理 逆定理 导数 |
Derivatives of Szasz-Mirakjan Type Operators and Smoothness of Function |
| |
Abstract: | By means of Ditzian-Totik modulus ωrφλ(f,t) of r order, where r∈N,0≤λ≤1, we derive the local and global characterization theorems for the derivatives of the Szasz-Mirakjan type operators. An equivalence relation including pointwise and global results between the derivatives of the operators and the smoothness of function is obtained. These results bridge the gap between the pointwise conclusions and the global conclusions. |
| |
Keywords: | Szasz-Mirakjan type operators simultaneous approximation direct theorem inverse theorem derivatives |
本文献已被 万方数据 等数据库收录! |
|