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What is reason for proper mass according to SR/GR.?

  1. Jun 14, 2012 #1
    we know proper mass is always constant irrespective of frame ie its invariant(and conserved if I can say).so whats reason for this proper mass.?
  2. jcsd
  3. Jun 15, 2012 #2

    Simon Bridge

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    The reason it is important to use proper mass is well described in wikipedia:

    ... generally it is useful to look for things that all observers can agree on - it makes the math simpler.
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