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 在作者為Bernstein,Fishbane, Gasiorowicz 的 Modern Physics 書裡
 在講相對論的章節裡
 後面有練習題
 其中有一題題目是

 Consider a two-body collision in which both momentum and energy are
 conserved in a particular reference frame S. Show that an observer in
 a frame moving with velocity v relative to S also sees energy and
 momentum to be conserved only if mass also is conserved in the process.

 意思是有的process前後能量動量並不守恆嗎?

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