diff --git a/math.tex b/math.tex
index 6bbf8f9..bc28c08 100644
--- a/math.tex
+++ b/math.tex
@@ -32,3 +32,6 @@
 \newcommand{\intgru}[2]{\int #1 ~\text{d}#2}
 
 \newcommand{\bbracket}[1]{\left #1 \right}
+
+\newcommand{\levicivita}[1]{\varEpsilon_{#1}}
+\newcommand{\krondelta}[1]{\delta_{+1}}
\ No newline at end of file