The Three Body Problem can refer to two different things. In physics and classical mechanics, it is a problem of taking the initial positions and velocities of three point masses and solving for their subsequent motion according to Newton's laws of motion and Newton's law of universal gravitation. It is a special case of the n-body problem.

On the other hand, The Three-Body Problem is also a science fiction novel written by Chinese writer Liu Cixin. The title refers to the three-body problem in orbital mechanics. It is the first novel of the Remembrance of Earth's Past trilogy.

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