diff --git a/report.tex b/report.tex
index 9182d49..febcb9c 100644
--- a/report.tex
+++ b/report.tex
@@ -831,11 +831,15 @@ $}
     We have to add some constraint terms that equals to zero, while contributes to the principal symbol, until the principal symbol matrix is diagonalizable with real eigenvalues.
 
     Available terms to add:
-    \begin{gather*}
+    \[
+    \scalebox{0.8}{$\displaystyle
+    \begin{aligned}
       \constraintA{_i} \qc \constraintB{^i_j} \qc \constraintC*{_i} \qc \constraintD*{_i_j_k},\\
       \Partial{_{[i}} \constraintA{_{j]}} = \Partial{_{[i}} \dlapse{_{j]}} \qc \Partial{_{[i}} \constraintB{^j_{k]}} = \Partial{_{[i}} \dshift{^j_{k]}} \qc \Partial{_{[i}} \constraintC*{_{j]}} = \Partial{_{[i}} \dchi*{_{j]}} \qc \Partial{_{[i}} \constraintD*{_{j]kl}} = \Partial{_{[i}} \dsmetric*{_{j]kl}},\\
       \Partial{_i} \left( \smetric*{^j^k} \Ktf*{_j_k} \right) \qc \Partial{_i} \left( \smetric*{^k^l} \dsmetric*{_j_k_l} \right)
-    \end{gather*}
+    \end{aligned}
+    $}
+    \]
   \end{frame}
 
   \begin{frame}{References}