diff --git a/src/math/mathop.pysty b/src/math/mathop.pysty
index 0be9557..a501017 100644
--- a/src/math/mathop.pysty
+++ b/src/math/mathop.pysty
@@ -167,6 +167,10 @@ __END_OPTIONS_X__
 \DeclareSimpleMathOperator{cov}
 \newcommand{\del}{\partial} % Semantically correct operator for boundary maps
 
+%% Algebraic geometry
+\DeclareSimpleMathOperator{eq}
+\DeclareSimpleMathOperator{Idem}
+
 % Characteristic function
 \newcommand*{\cfun}{\ensuremath{\mathbbm{1}}}
 \newcommand*{\One}{\cfun}