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Diffstat (limited to 'source/know/concept/lehmann-representation')
| -rw-r--r-- | source/know/concept/lehmann-representation/index.md | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/source/know/concept/lehmann-representation/index.md b/source/know/concept/lehmann-representation/index.md index 74bd457..0dec718 100644 --- a/source/know/concept/lehmann-representation/index.md +++ b/source/know/concept/lehmann-representation/index.md @@ -40,7 +40,7 @@ $$\begin{aligned} \Matrixel{n}{e^{i \hat{H} (t - t') / \hbar} \hat{c}_\nu e^{- i \hat{H} (t - t') / \hbar} \hat{c}_{\nu'}^\dagger}{n} \end{aligned}$$ -Where we used that the trace $$\Tr\!(x) = \sum_{n} \matrixel{n}{x}{n}$$ +Where we used that the trace $$\Tr(x) = \sum_{n} \matrixel{n}{x}{n}$$ is invariant under cyclic permutations of $$x$$. The $$\Ket{n}$$ form a basis of eigenstates of $$\hat{H}$$, so we insert an identity operator $$\sum_{n'} \Ket{n'} \Bra{n'}$$: |