The classical Kepler-Coulomb system in 3 dimensions is well known to be 2nd order superintegrable. with a symmetry algebra that closes polynomially under Poisson brackets. This polynomial closure is typical for 2nd order superintegrable systems in 2D and for 2nd order systems in 3D with nondegenerate (4-parameter) potentials. However the degenerate 3-parameter potential for the 3D ext... https://parisnaturalfoodes.shop/product-category/deodorant-sexy-sadie/