Add mathtools package to mjo-common.tex.

diff --git a/mjo-common.tex b/mjo-common.tex
index edb5428046caad9e17e75fad390f1d56a3f8d819..4df86a07a3a9d70cbe77a2bc62aeebc6e178ffd5 100644 (file)
--- a/mjo-common.tex
+++ b/mjo-common.tex
@@ -2,6 +2,8 @@
 % Only the most commonly-used macros. Needed by everything else.
 %
 
+\usepackage{mathtools}
+
 % Place the argument in matching left/right parntheses.
 \DeclarePairedDelimiter{\of}{ \lparen }{ \rparen }