Rigid Body

In physics, a rigid body is an idealisation of a solid body of finite dimension in which deformation is neglected. In other words, the distance between any two given points of a rigid body remains constant regardless of external forces exerted on it. The configuration space of a rigid body with one point fixed is given by the underlying manifold of the rotation group SO(3). This is just the real projective space RP3. The configuration space of a nonfixed rigid body is just R3 × RP3, the first factor accounting for translations.

 

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