diff --git a/math.tex b/math.tex
index 3ed26ef..3f6893a 100644
--- a/math.tex
+++ b/math.tex
@@ -60,5 +60,7 @@
 
 \newcommand{\levicivita}[1]{\varepsilon_{#1}}
 \newcommand{\krondelta}[1]{\delta_{#1}}
+% \newcommand{\sum}[3]{\Sigma_{#1}^{#2} #3}
+% \newcommand{\prod}[3]{\Pi_{#1}^{#2} #3}
 
 \newcommand{\equationblock}[1]{\begin{equation} #1 \end{equation}}