On an optimal quadrature formula for approximation of Fourier integrals in the space $W_2^{(1,0)}$

Abstract

The present paper is devoted to construction of an optimal quadrature formula\nfor approximation of Fourier integrals in the Hilbert space $W_2^{(1,0)}[a,b]$\nof non-periodic, complex valued functions.\n Here the quadrature sum consists of linear combination of the given function\nvalues on uniform grid. The difference between integral and quadrature sum is\nestimated by the norm of the error functional. The optimal quadrature formula\nis obtained by minimizing the norm of the error functional with respect to\ncoefficients. In addition, analytic formulas for optimal coefficients are\nobtained using the discrete analogue of the differential operator $d^2/d\nx^2-1$. Further, the order of convergence of the optimal quadrature formula is\nstudied.\n