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Normal order of A + B

  1. Feb 18, 2013 #1
    1. The problem statement, all variables and given/known data

    Hi, guys, I just wondering what's the normal order of A +B

    2. Relevant equations

    if N[A+B]=N[A]+N
    then I have
    however we know that
    what's wrong?

    3. The attempt at a solution

    another example,

    thank you!
  2. jcsd
  3. Feb 18, 2013 #2

    George Jones

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    Staff Emeritus
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    Gold Member

    [itex]N \left[ 1 \right] = N \left[ aa^\dagger + a^\dagger a \right][/itex] and linearity gives?
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