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Dec 19, 2019 at 17:10 comment added Josiah Park Levenshtein's paper does this well too, although it is not primarily concerned with the expansions, but rather applications. V. I. Levenshtein. Designs as maximum codes in polynomial metric spaces. Acta Appl. Math.29(1992),1–82. MR1192833
Dec 19, 2019 at 17:00 comment added Josiah Park Wang classified all the compact two-point homogeneous spaces: H.-C. Wang.Two-Point Homogeneous Spaces. Ann. of Math.55(1952), 177–191. MR0047345, and Gangolli's paper: Positive definite kernels on homogeneous spaces and certain stochastic processes related to L ́evy’s Brownian motion of several parameters. Ann. Inst. H. Poincar ́e Sect. B (N.S.)3(1967), 121–226. MR0215331, might also be relevant. There are also more recent papers which deal with expansions into harmonics, such as the following: M. M. Skriganov. Point distribution in compact metric spaces, III. Two-point homogeneous spaces.
Dec 19, 2019 at 16:46 comment added user114668 Thank you for your answer! I am in fact interested in finding cases with other functions on the rhs. of the addition theorem. If you had a reference for the harmonics of other two-point homogeneous spaces, that could be immensely helpful.
Dec 19, 2019 at 15:17 history edited Josiah Park CC BY-SA 4.0
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Dec 19, 2019 at 15:11 history edited Josiah Park CC BY-SA 4.0
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Dec 19, 2019 at 15:06 history answered Josiah Park CC BY-SA 4.0