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Angular momentum in bracket notation

  1. Sep 27, 2011 #1
    Hello,

    why is

    [itex] <j' m' | j m>=0[/itex]

    if

    [itex] j \not= j' \; \text{or} \; m \not= m'[/itex]

    j and m are describing states. I don't understand why an 'empty bracket' behaves like that.
     
  2. jcsd
  3. Sep 27, 2011 #2

    phyzguy

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