On an optimal quadrature formula in Sobolev space L2(m)(0,1)

摘要

This paper studies the problem of construction of optimal quadrature formulas in the sense of Sard in the space L2(m)(0,1). In this paper the quadrature sum consists of values of the integrand at nodes and values of the first derivative of the integrand at the end points of the integration interval. The coefficients of optimal quadrature formulas are found and the norm of the optimal error functional is calculated for arbitrary natural number N and for any m≥2 using the S.L. Sobolev method which is based on a discrete analog of the differential operator d2m/dx2m. In particular, for m=2,3 optimality of the classical Euler–Maclaurin quadrature formula is obtained. Starting from m=4 new optimal quadrature formulas are obtained.