It is a classical result of Bernstein that the sequence of Lagrange interpolation polynomials to | x | at equally spaced nodes in [- 1,1] diverges everywhere, e
In this paper we consider a convolution operator Tf=p.v.Ω*f with Ω(x)=K(x)×e<sup>(r)</sup>λ】0.where K(x)is a weak Calderon-Zygmund kernel and h(x)is a real-value