X-Git-Url: http://gitweb.michael.orlitzky.com/?a=blobdiff_plain;f=mjo-algebra.tex;h=88523456235e4bde91b99d9f99f1fcd41280588c;hb=ba0227140d34fe1c8cacdb4996b5896aec4c4013;hp=d70d9fd919fa1d39da8036953c03b3d52ce27426;hpb=e157fa83770cf671d8b1ce897964ee5297e0b1eb;p=mjotex.git

diff --git a/mjo-algebra.tex b/mjo-algebra.tex
index d70d9fd..8852345 100644
--- a/mjo-algebra.tex
+++ b/mjo-algebra.tex
@@ -1,3 +1,10 @@
+%
+% Abstract algebraic structures.
+%
+\ifx\havemjoalgebra\undefined
+\def\havemjoalgebra{1}
+
+
 % Needed for \operatorname.
 \usepackage{amsopn}
 
@@ -11,3 +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