Simultaneous Approximation For Combinations Of Szász-type Operators

For linear combinations of Szdsz-type Operators, Li Bingzheng gave the pointwise estimates. Qi Qiulan extended these results using the modulus of Smoothness In this paper we discuss the simultaneous approximation for the r-order linear combinations of Szdsz-type Operators with the modulus of smoothness and unite the corresponding results of classical and the Ditzian-Totik moduli of smoothness.