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Results tagged with homework-and-exercises
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user 252143
Applies to questions of primarily educational value - not only questions that arise from actual homework assignments, but any question where it is preferable to guide the asker to the answer rather than giving it away outright. Please READ THE GUIDANCE IN META before asking homework-like questions.
11
votes
2
answers
5k
views
Levi Civita identity
I've been trying to use the following identity (provided by wikipedia)
$$\epsilon^{i_1...i_n}\epsilon_{j_1...j_n} = \delta_{j_1...j_n}^{i_1...i_n} \equiv n!\delta_{[j_1}^{i_1}...\delta_{j_n]}^{i_n}$$ …
- 155
1
vote
1
answer
525
views
Explicit expressions for the creation and annihilation operators
What are the explicit expressions for the creation and annihilation operators $\hat{a_\vec p}$ and $\hat{a}^{\dagger}_\vec p$ for bosons? I can't find them anywhere, as every source seems to introduce …
- 155