Add the Cartesian product \cartprod command.

diff --git a/mjo-common.tex b/mjo-common.tex
index a4457883acbea4f39adfa6e90e63684533e37eed..8dae2cff42f0d75693f2a01b3c853c74b526ef9b 100644 (file)
--- a/mjo-common.tex
+++ b/mjo-common.tex
@@ -23,6 +23,9 @@
 % A pair of things.
 \providecommand*{\pair}[2]{ \left( {#1}, {#2} \right) }
 
+% The Cartesian product of two things.
+\providecommand*{\cartprod}[2]{ {#1} \times {#2} }
+
 %
 % Product spaces
 %