IHateMayonnaise
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Homework Statement
Part of a much larger problem dealing with the Heisenberg picture. I am not remembering how to start evaluating the following commutator:
\left [ a_k(t),\left(\sum_{k,\ell}a_k^\dagger <k|h|\ell>a_\ell\right)\right]
Homework Equations
See (a)
The Attempt at a Solution
Just need some help getting started on this one, after that I'm good. What I do know is that when you do the commutator you cannot just lump the first term (a_k(t)) into the sum.. any hints on how to go about breaking this down? Halp!
Thanks
IHateMayonnaise