The Many-body problem reference article from the English Wikipedia on 24-Apr-2004 (provided by Fixed Reference: snapshots of Wikipedia from wikipedia.org)

Many-body problem

"It would indeed be remarkable if Nature fortified herself against further advances in knowledge behind the analytical difficulties of the many-body problem." (Max Born, 1960)

Many-body problem may be defined as the study of the effects of interaction between bodies on the behaviour of a many-body system. One of the preferred methods for solving the problem is simply to ignore it, i.e., pretend there is no interactions present.

Another approach is the canonical transformation technique.

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