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diff --git a/mjo-algebra.tex b/mjo-algebra.tex
index 010ab05..8852345 100644
--- a/mjo-algebra.tex
+++ b/mjo-algebra.tex
@@ -1,6 +1,9 @@
 %
 % Abstract algebraic structures.
 %
+\ifx\havemjoalgebra\undefined
+\def\havemjoalgebra{1}
+
 
 % Needed for \operatorname.
 \usepackage{amsopn}
@@ -15,3 +18,6 @@
 % coefficients is the first argument and whose indeterminates (a
 % comma-separated list) are the second argumnt.
 \newcommand*{\polyring}[2]{{#1}\left[{#2}\right]}
+
+
+\fi