Multipole expansion (interaction)/Definition

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https://en.citizendium.org/wiki/index.php?title=Multipole_expansion_(interaction)/Definition&printable=yes
A definition or brief description of Multipole expansion (interaction).

A mathematical series representing a function that depends on angles, and frequently used in the study of electromagnetic, and gravitational fields, where the fields at distant points are given in terms of sources in a small region.

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