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Zur Charakterisierung und Berechnung von symmetrischen Kubaturformeln

On the characterization and computation of symmetric cubature formulae

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Zusammenfassung

Diese Arbeit befaßt sich mit der Charakterisierung und Berechnung von symmetrischen Kubaturformeln vom Grad 2k−1 für zweidimensionale Produktfunktionale. Die Knotenanzahlr der Kubaturformeln genügt der folgenden Ungleichung:

$$\frac{{k(k + 1)}}{2} + \left[ {\frac{k}{2}} \right] \leqslant r \leqslant \frac{{k(k + 1)}}{2} + \left[ {\frac{k}{2}} \right] + 1.$$

Die dabei auftretenden nichtlinearen Gleichungssysteme werden entweder exakt gelöst oder alle Lösungen werden mit beliebiger Genauigkeit mit Hilfe eines Programmpaketes für symbolische und algebraische Berechnungen ermittelt.

Abstract

The paper is concerned with the characterization and calculation of symmetric cubature formulae of degree 2k−1 for two-dimensional product-functionals. The number of knots of the cubature formulae satisfies the following relation:

$$\frac{{k(k + 1)}}{2} + \left[ {\frac{k}{2}} \right] \leqslant r \leqslant \frac{{k(k + 1)}}{2} + \left[ {\frac{k}{2}} \right] + 1.$$

The systems of non-linear equations involved are either solved exactly or all solutions are computed with any precision using a program-package for symbolic and algebraic calculations.

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Münzel, G., Renner, G. Zur Charakterisierung und Berechnung von symmetrischen Kubaturformeln. Computing 31, 211–230 (1983). https://doi.org/10.1007/BF02263432

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