Abstract
Following the approach of a previous paper, the Clebsch‐Gordan problem for the group SU(1,1) for products of the form D + ⊗D − is related to properties of the pseudo‐orthogonal O(2,2). A new understanding of the Clebsch‐Gordan series for this case is achieved by analyzing the properties of O(2,2) spherical harmonics. The Clebsch‐Gordan coefficients in a continuous basis are also calculated.

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