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Homework Help: Vector identities in quantum mechanics

  1. May 1, 2016 #1
    The overall problem is to prove that [L^2,[L^2,\hat{r}]]=2\hbar^2 {L^2,r}

    I feel I am very close to solving this problem but I need a quantum version of the vector identity ax(bxc). Because the relevant vectors are operators that don't commute, there is a problem.

    Does anybody know of a source of vector identities that don't assume commutation?

  2. jcsd
  3. May 6, 2016 #2
    Thanks for the post! This is an automated courtesy bump. Sorry you aren't generating responses at the moment. Do you have any further information, come to any new conclusions or is it possible to reword the post?
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