Add the \directsum operator.

[mjotex.git] / mjo-common.tex

diff --git a/mjo-common.tex b/mjo-common.tex
index e19d7883e6d9a7c70a5865d314cc9dabf1762f46..0a9a5d206941c55346153e22bc0b41a8c7cc4510 100644 (file)
--- 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
 %