diff --git a/math.tex b/math.tex
index bc28c08..13a8b54 100644
--- a/math.tex
+++ b/math.tex
@@ -27,11 +27,13 @@
 
 \newcommand{\diffP}[1]{\frac{\partial}{\partial #1}}
 \newcommand{\diffT}[1]{\frac{\text{d}}{\text{d} #1}}
+\newcommand{\diffTfrac}[2]{\frac{\text{d} #1}{\text{d} #2}}
+\newcommand{\diffTm}[3]{\diffTfrac{^{#1} #2}{#3^{#1}}}
 \newcommand{\diffPfrac}[2]{\frac{\partial #1}{\partial #2}}
 \newcommand{\intgr}[4]{\int_{#1}^{#2} #3 ~\text{d}#4}
 \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
+\newcommand{\levicivita}[1]{\varepsilon_{#1}}
+\newcommand{\krondelta}[1]{\delta_{#1}}
\ No newline at end of file