Best quadrature formula on Sobolev class with Chebyshev weight

Using best interpolation function based on a given function information, we present a best quadrature rule of function on Sobolev class KWr[-1,1]KWr[-1,1] with Chebyshev weight. The given function information means that the values of a function f∈KWr[-1,1]f∈KWr[-1,1] and its derivatives up to r-1r-1 order at a set of nodes xx are given. Error bounds are obtained, and the method is illustrated by some examples.