摘要
In this paper, with the help of modulus of smoothness ω2r(f,t), we discuss the pointwise approximation properties for the iterated Boolean sums of Bernstein operator B n and obtain direct and inverse theorems when 1-1/r ≤λ≤ 1, r ∈N.
In this paper, with the help of modulus of smoothness ωφ^2r(f,t),, we discuss thepointwise approximation properties for the iterated Boolean sums of Bernstein operator B,~ 1and obtain direct and inverse theorems when 1-1/r≤λ≤1,r∈N.
基金
Supported by the NNSF of China(10771049)