Volume 6, no. 4 Pages 87 - 100

# Quadrature Formulas with High Order Approximation

D.A. Silaev
In the article the method of creation the quadrature formulas with high order approximation for a wide class of the areas is given. This method is based on approach of smooth function on the plane by the semilocal smoothing spline or S-spline. Semilocal smoothing splines are initiated by D.A. Silaev. Earlier the splines of the third and fifth degree are considered and applied. This work is devoted to use of S-splines of higher degrees. Steady S-splines of a class of C^0 (only continuous), consisting of polynoms of high degree of n (n=9, 10) makes it possible to receive quadrature formulas of the 10th and 11th orders of approximation. It is supposed that integrand function belongs to C^p class (to p=10, 11) in a bigger area, than initial area on which integration is conducted. It is also supposed that the border of area is set parametrically that helps to consider area border with a fine precision. Similar approach is possible for the construction of cubature formulas.
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Keywords
an approximation; a spline; integrals; quadrature formulas; numerical methods.
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