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-rw-r--r--source/know/concept/lehmann-representation/index.md2
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 $$\sum_{n'} \Ket{n'} \Bra{n'}$$: