diff --git a/src/math/mathop.pysty b/src/math/mathop.pysty
index 1f04705..0a2aaa7 100644
--- a/src/math/mathop.pysty
+++ b/src/math/mathop.pysty
@@ -178,3 +178,10 @@ __END_OPTIONS_X__
 \def\norm{\@ifstar{\oldnorm}{\oldnorm*}}
 
 \DeclareMathOperator{\amalgprod}{\star}
+
+
+\newcommand\op{\text{op}}
+\newcommand\opposite{^{\op}}
+
+\newcommand\ab{\text{ab}}
+\newcommand\abelianization{^{\ab}}