X-Git-Url: http://gitweb.michael.orlitzky.com/?p=mjotex.git;a=blobdiff_plain;f=mjo-common.tex;h=0a9a5d206941c55346153e22bc0b41a8c7cc4510;hp=408ca3310e7dbff8e498936e4bfefbe77e49c483;hb=58dd2634228390d7a902edf9bf70570e22ebbf4e;hpb=a688c85fecb01a14d1ce3c123c35da5c55083c3e

diff --git a/mjo-common.tex b/mjo-common.tex
index 408ca33..0a9a5d2 100644
--- a/mjo-common.tex
+++ b/mjo-common.tex
@@ -29,6 +29,9 @@
 % The Cartesian product of three things.
 \providecommand*{\cartprodthree}[3]{ \cartprod{{#1}}{\cartprod{{#2}}{{#3}}} }
 
+% The direct sum of two things.
+\providecommand*{\directsum}[2]{ {#1}\oplus{#2} }
+
 % The factorial operator.
 \providecommand*{\factorial}[1]{ {#1}! }