Abstract
The general power rn = (r12 − 2r1 r2 cos ω + r22)n/2 of the distance between two points is expressed as a Fourier series Σ Rn, l(r1, r2) cos lω. Following Sack's method, the radial functions Rn, l are obtained as power series in r</r>. Symmetrical expressions in r1 and r2 and recurrence relations are found for Rn, l.

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