Editing Many-body problem (section)

==Terminology==
{{Unsourced|section|date=February 2025}}
''Microscopic'' here implies that [[quantum mechanics]] has to be used to provide an accurate description of the system. ''Many'' can be anywhere from three to infinity (in the case of a practically infinite, [[Homogeneity (physics)|homogeneous]] or periodic system, such as a [[crystal]]), although three- and four-body systems can be treated by specific means (respectively the [[Faddeev equations|Faddeev]] and Faddeev–Yakubovsky equations) and are thus sometimes separately classified as [[few-body systems]].