X-Git-Url: http://gitweb.michael.orlitzky.com/?p=mjotex.git;a=blobdiff_plain;f=mjo-common.tex;h=408ca3310e7dbff8e498936e4bfefbe77e49c483;hp=e19d7883e6d9a7c70a5865d314cc9dabf1762f46;hb=2b6f9aa58154ba0d7d25a94f7f74674139b5ac92;hpb=22c2d3825cff157d59e5b9d22570ca2465939c6f

diff --git a/mjo-common.tex b/mjo-common.tex
index e19d788..408ca33 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 factorial operator.
+\providecommand*{\factorial}[1]{ {#1}! }
+
 %
 % Product spaces
 %