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What is ↔ mean? in commutation relation?

  1. Jun 12, 2013 #1
    I found this in Srednicki's QFTbook.
    I don't know what ↔ means.
    Help me, please
     

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  2. jcsd
  3. Jun 12, 2013 #2
    Presumably "the same term as before, but with the two indices exchanged". It should be deductible from the context, though.
     
  4. Jun 12, 2013 #3
    Like this?
     

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  5. Jun 12, 2013 #4

    Bill_K

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    Science Advisor

    Yes, like that. (Except you forgot the i.) This is Eq (34.4) in Srednicki.
     
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