What is ↔ mean? in commutation relation?

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Discussion Overview

The discussion revolves around the meaning of the symbol "↔" in the context of commutation relations as presented in Srednicki's Quantum Field Theory book. Participants seek clarification on its interpretation and usage within the equations discussed.

Discussion Character

  • Conceptual clarification

Main Points Raised

  • One participant expresses confusion about the meaning of "↔" in commutation relations.
  • Another participant suggests that it likely indicates "the same term as before, but with the two indices exchanged," implying that context should clarify its use.
  • A subsequent post seeks to confirm understanding by providing an example.
  • A later reply affirms the example but notes a minor correction regarding an omitted term.

Areas of Agreement / Disagreement

The discussion does not reach a consensus on the meaning of "↔," but participants generally agree on the interpretation involving index exchange, with some clarification needed regarding specific terms.

rar0308
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I found this in Srednicki's QFTbook.
I don't know what ↔ means.
Help me, please
 

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Presumably "the same term as before, but with the two indices exchanged". It should be deductible from the context, though.
 
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Like this?
 

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