1. Limited time only! Sign up for a free 30min personal tutor trial with Chegg Tutors
    Dismiss Notice
Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

Commutation proof

  1. Apr 18, 2006 #1
    Hi there, I need a help on one of the commutation proof,
    the question is, show that [Lx,L^2]=0 cyclic where L=l1+l2
    The expression simplifies to [Lx,l1l2]+[Lx,l2l1] but I'm not sure if they are 0.
    Thanks for your help :D
  2. jcsd
  3. Apr 18, 2006 #2


    User Avatar
    Science Advisor
    Homework Helper

    What does L=l1+l2 mean ...?

  4. Apr 18, 2006 #3

    Meir Achuz

    User Avatar
    Science Advisor
    Homework Helper
    Gold Member

    write L_x=L1_x+L2_x
    and expand L^2=(L1+L2)^2=...
Know someone interested in this topic? Share this thread via Reddit, Google+, Twitter, or Facebook

Similar Discussions: Commutation proof
  1. Commutator proof (Replies: 4)