Add \directsumthree to mjo-common.

[mjotex.git] / mjo-common.tex

diff --git a/mjo-common.tex b/mjo-common.tex
index f96528eac1acc710babe3ec790219d5babfab4bd..fe4ee5264facee2fd54dd657ed107ead679d2195 100644 (file)
--- a/mjo-common.tex
+++ b/mjo-common.tex
@@ -2,6 +2,9 @@
 % Only the most commonly-used macros. Needed by everything else.
 %
 
+% Needed for \mathbb.
+\usepackage{amsfonts}
+
 % Place the argument in matching left/right parntheses.
 \providecommand*{\of}[1]{ \left({#1}\right) }
 
@@ -35,6 +38,9 @@
 % The direct sum of two things.
 \providecommand*{\directsum}[2]{ {#1}\oplus{#2} }
 
+% The direct sum of three things.
+\providecommand*{\directsumthree}[3]{ \directsum{#1}{\directsum{#2}{#3}} }
+
 % The factorial operator.
 \providecommand*{\factorial}[1]{ {#1}! }