diff --git a/HF/Loos-TCCM_HF.tex b/HF/Loos-TCCM_HF.tex
index 6d5e793..b7553f5 100644
--- a/HF/Loos-TCCM_HF.tex
+++ b/HF/Loos-TCCM_HF.tex
@@ -1095,9 +1095,9 @@ These orbitals are called \orange{canonical molecular orbitals}  (= eigenvectors
 	\begin{block}{Solution}
 		We expand $\Psi$ in a \alert{clever basis} 
 		\begin{equation*}
-			\Psi = \sum_{i=1}^\infty c_i \,\varphi_i 
+			\Psi = \sum_{i}^\infty c_i \,\varphi_i 
 			\qq{with}
-			\sum_{i=1}^\infty c_i^2 = 1
+			\sum_{i}^\infty c_i^2 = 1
 		\end{equation*}
 		\pause
 		\begin{equation*}