X-Git-Url: http://gitweb.michael.orlitzky.com/?a=blobdiff_plain;f=mjo-common.tex;h=0a9a5d206941c55346153e22bc0b41a8c7cc4510;hb=58dd2634228390d7a902edf9bf70570e22ebbf4e;hp=e19d7883e6d9a7c70a5865d314cc9dabf1762f46;hpb=38147a40c34416d5dbd87f44d8786e3dd73a132f;p=mjotex.git

diff --git a/mjo-common.tex b/mjo-common.tex
index e19d788..0a9a5d2 100644
--- a/mjo-common.tex
+++ b/mjo-common.tex
@@ -29,6 +29,12 @@
 % 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}! }
+
 %
 % Product spaces
 %