Recent content by Ernesto Paas

  1. Ernesto Paas

    I When can one clear the operator

    Ok it hadn't occurred to me to think of them in that way. It wouldn't make sense to do a commutation there if the rows didn't equal the columns. Nevertheless, moving scalars around wouldn't be a problem. Thanks, it was actually really easy...
  2. Ernesto Paas

    I When can one clear the operator

    Is the operator like glued to the left ket? Can I move the bra around?
  3. Ernesto Paas

    I When can one clear the operator

    I don't know, that's the problem. I've seen bras and kets being moved around without being eigenstates of an operator. Like in this case $$ \langle a | b \rangle \langle c1 | A | c2 \rangle \langle d | e \rangle = \langle a | b \rangle \langle d | e \rangle \langle c1 | A | c2 \rangle $$
  4. Ernesto Paas

    I When can one clear the operator

    Ah no... Sorry for not pointing that out. They are just of the same same arbitrary orthonormal basis.
  5. Ernesto Paas

    I When can one clear the operator

    Hi all! I'm having problems understanding the operator algebra. Particularly in this case: Suppose I have this projection ## \langle \Phi_{1} | \hat{A} | \Phi_{2} \rangle ## where the ##\phi's ## have an orthonormal countable basis. If I do a state expansion on both sides then I suppose I'd get...
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