- #1
fuchini
- 11
- 0
Homework Statement
Need to show that [tex][a,f(a,a^\dagger]=\frac{\partial f}{\partial a^\dagger}[/tex]
Homework Equations
[tex][a,a^\dagger]=1[/tex]
The Attempt at a Solution
Need to expand [tex]f(a,a^\dagger)[/tex] in a formal power series. However I don´t know how to do it if the variables don´t commute.
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