摘要
研究Sz sz型算子的局部点态和整体逼近定理,得到了逼近正逆定理,并用Ditzian Totik模刻画了该算子局部点态和整体逼近的特征,所得结果统一了该算子点态和整体两种逼近特征的等价表征.
By means of DitzianTotik moduli ω2φλ(f,t) of second order,where 0≤λ≤1,the local and global theorems for the Szsz type operators are studied.Both direct and converse theorems are derived.These results bridge the gap between the pointwise and global conclusions.
出处
《宁夏大学学报(自然科学版)》
CAS
2002年第3期222-223,227,共3页
Journal of Ningxia University(Natural Science Edition)