\input{mjo-common} % for \of, and \binopmany
+% The additive identity element of its argument, which should be
+% an algebraic structure.
+\newcommand*{\zero}[1]{ 0_{{#1}} }
+
+\ifdefined\newglossaryentry
+ \newglossaryentry{zero}{
+ name={\ensuremath{\zero{R}}},
+ description={the additive identity element of $R$},
+ sort=z
+ }
+\fi
+
% The multiplicative identity element of its argument, which should be
% an algebraic structure.
\newcommand*{\unit}[1]{ 1_{{#1}} }
\fi
+% The stabilizer subgroup of its first argument that fixes the point
+% given by its second argument.
+\newcommand*{\Stab}[2]{ #1_{#2} }
+
+
+% The affine algebraic variety consisting of the common solutions to
+% every polynomial in its argument, which should be a subset of some
+% polynomial ring.
+\newcommand*{\variety}[1]{ \mathcal{V}\of{{#1}} }
+\ifdefined\newglossaryentry
+ \newglossaryentry{variety}{
+ name={\ensuremath{\variety{I}}},
+ description={variety corresponding to the ideal $I$},
+ sort=v
+ }
+\fi
+
\fi