= Solid harmonics
{wiki=Solid_harmonics}
Solid harmonics are mathematical functions that are used in various fields such as physics, engineering, and applied mathematics to describe functions on the surface of a sphere and in three-dimensional space. They are a generalization of spherical harmonics, which are typically defined on the surface of a sphere. In essence, solid harmonics can be thought of as a set of basis functions for representing scalar fields in three-dimensional space.
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