q**********7 发帖数: 857 | 1 Weinberg's Quantum Theory of Fields VI.
Page 78. He gave the last equation but he didn't prove it, although he
qualitatively explained it. I tried to prove it quantitatively but I failed.
Also, in page 80, he didn't prove the first equation either. I need help
with those two equations.
The two pictures are from Google http://books.google.com/books?id=NcH...page&q&f=false |
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