X-Git-Url: http://gitweb.michael.orlitzky.com/?a=blobdiff_plain;f=mjo-common.tex;h=efa10a26045d9f199bd3bdb1f8c9f5ec97c1cb19;hb=d84c704c13a2e30c232710801c5483059094dac3;hp=e19d7883e6d9a7c70a5865d314cc9dabf1762f46;hpb=38147a40c34416d5dbd87f44d8786e3dd73a132f;p=mjotex.git

diff --git a/mjo-common.tex b/mjo-common.tex
index e19d788..efa10a2 100644
--- a/mjo-common.tex
+++ b/mjo-common.tex
@@ -23,12 +23,21 @@
 % A pair of things.
 \providecommand*{\pair}[2]{ \left({#1},{#2}\right) }
 
+% A triple of things.
+\providecommand*{\triple}[3]{ \left({#1},{#2},{#3}\right) }
+
 % The Cartesian product of two things.
 \providecommand*{\cartprod}[2]{ {#1}\times{#2} }
 
 % 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
 %