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Oct 28, 2011 at 9:39 comment added Cyril Soler you can see them as harmonic polynomials of 3 variables restricted to the unit sphere.
Oct 28, 2011 at 9:02 answer added Denis Serre timeline score: 1
Oct 28, 2011 at 8:49 comment added Denis Serre It seems (because of $2\ell+1$) that your harmonic polynomials depend on three variables $x_1,x_2,x_3$. Right ?
Oct 28, 2011 at 7:48 history asked Cyril Soler CC BY-SA 3.0