A General Superconvergence Result for Cubature on Tesselated Polytopal Domains in Two and Three Dimensions

Abstract

Cubature rules, which approximate definite integrals as a linear combination of a set of function values, are ubiquitous and necessary for computational methods in the physical sciences. A superconvergence result for cubature rules on polytopal domains in two and three dimensions is developed, whereby a rule that is exact for all bivariate polynomials of a fixed even degree realizes an extra order of convergence under a decrease in the spacing between nodes.

arXiv commentThis work updates and corrects the proof of a previous version, while extending the result to three dimensions