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-rw-r--r--content/know/concept/hellmann-feynman-theorem/index.pdc2
1 files changed, 1 insertions, 1 deletions
diff --git a/content/know/concept/hellmann-feynman-theorem/index.pdc b/content/know/concept/hellmann-feynman-theorem/index.pdc
index 3b88cd8..1d2fe82 100644
--- a/content/know/concept/hellmann-feynman-theorem/index.pdc
+++ b/content/know/concept/hellmann-feynman-theorem/index.pdc
@@ -74,7 +74,7 @@ to minimize energies with respect to $\lambda$:
$$\begin{aligned}
\boxed{
\nabla_\lambda E_n
- = \matrixel{\psi_m}{\nabla_\lambda \hat{H}}{\psi_n}
+ = \matrixel{\psi_n}{\nabla_\lambda \hat{H}}{\psi_n}
}
\end{aligned}$$