在这篇论文,我们调查 Bernstein-Sikkema 操作员的同时的近似,并且由使用光滑的 Ditzian-Totik 模量建立直接、相等的定理。
In this paper, we investigate the simultaneous approximation of Bernstein- Sikkema operators, and establish the direct and equivalent theorems by using the Ditzian-Totik modulus of smoothness.