Could someone give a reference for the statement:
"the algebra of $SO(n)$- (or $O(n)$-) invariant operators on the sphere $S^{n−1}$ ($n>2$) is precisely equal to the algebra of polynomials in the Laplace operator"?
Thanks.
2026-03-24 20:30:45.1774384245
reference request: Invariant differential operators on the sphere
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