Bernstein-Sikkema算子的点态逼近

Pointwise Approximation for Bernstein-Sikkema Operators

给出了Bernstein Sikkema算子的点态正定理,并运用正规算子方法得到了该算子关于Ditzian模的逼近等价定理,从而改善了已有的结果.

The authors give a pointwise direct theorem for Bernstein-Sikkema operators using the Ditzian modulous of smoothness, then use the general operators method to obtain an equivalent theorem for the operators, therefore extend the known results.