diff --git a/tex/presentation.tex b/tex/presentation.tex
index 211d25f..027b22d 100755
--- a/tex/presentation.tex
+++ b/tex/presentation.tex
@@ -179,11 +179,11 @@
     \textbf{\color{red} linear combination}
     of the content and style losses:
 
-    $$
+    \begin{equation}
     \mathcal{L}_{total} =
     \alpha \mathcal{L}_{content} +
     \beta \mathcal{L}_{style}
-    $$
+    \end{equation}
 \end{frame}