相对速度的概念
Concepts of relative velocity
摘要：
相对论的中心概念是速度的相对性。物体的速度不是物体的固有性质，它取决于自由选择的参考系。因此，相对速度是依赖于参考的，它不是一个绝对的概念。我们强调，即使是零速度也必须是相对的。每一个参考系都有它自己的只相对于那个特定参考系的零速度。用相对速度表述的相对论，有许多零速度，是否意味着洛仑兹等距群？我们讨论了伽利略和庞加莱的许多相对空间，作为商空间。
英文摘要：
The central concept of the theory of relativity is the relativity of velocity. The velocity of a material body is not an intrinsic property of the body; it depends on a free choice of reference system. Relative velocity is thus reference-dependent, it is not an absolute concept. We stress that even zero-velocity must be relative. Every reference system possesses its own zero-velocity relative only to that particular reference system. Does the theory of relativity formulated in terms of relative velocities, with many zero-velocities, imply the Lorentz isometry group? We discuss the many relative spaces of Galileo and Poincare, as quotient spaces.
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