Summary
In this paper an approach is outlined to the two-dimensional analogon of the Gaussian quadrature problem. The main results are necessary and sufficient conditions for the existence of cubature formulae which are exact for all polynomials of degree ≦m and which have a minimal number of 1/2k(k+1) knots,k=[m/2]+1. Ifm is odd, similar results are due to I.P. Mysovskikh ([5, 6]) which will be derived in a new way as a special case of the general characterization given here. Furthermore, it will be shown how this characterization can be used to construct minimal formulae of even degree.
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Schmid, H.J. On cubature formulae with a minimal number of knots. Numer. Math. 31, 281–297 (1978). https://doi.org/10.1007/BF01397880
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DOI: https://doi.org/10.1007/BF01397880