X-Git-Url: http://gitweb.michael.orlitzky.com/?a=blobdiff_plain;f=mjo-common.tex;h=1a8f6fe4ac45f7ce32fe64106ffa15ccc486addd;hb=db9108a5c69e72667f4731880f1e3173459675fd;hp=61ea7c48e7cd8fe0d6ead881d37c5275330b6a0a;hpb=5f2d44683ba6cb73b45d572724e827f70641660d;p=mjotex.git

diff --git a/mjo-common.tex b/mjo-common.tex
index 61ea7c4..1a8f6fe 100644
--- a/mjo-common.tex
+++ b/mjo-common.tex
@@ -78,6 +78,10 @@
   \mathbb{C}\if\detokenize{#1}\detokenize{1}{}\else^{#1}\fi
 }
 
+% The space of symmetric n-by-n matrices.
+\providecommand*{\Sn}[1][n]{
+  \mathcal{S}\if\detokenize{#1}\detokenize{1}{}\else^{#1}\fi
+}
 
 %
 % Basic set operations
@@ -108,5 +112,7 @@
              { {#1}_{#2}^{#3}{#4} }
 }
 
-\providecommand*{\unionmany}[3]{ \binopmany{\cup}{#1}{#2}{#3} }
 \providecommand*{\intersectmany}[3]{ \binopmany{\cap}{#1}{#2}{#3} }
+\providecommand*{\cartprodmany}[3]{ \binopmany{\times}{#1}{#2}{#3} }
+\providecommand*{\directsummany}[3]{ \binopmany{\oplus}{#1}{#2}{#3} }
+\providecommand*{\unionmany}[3]{ \binopmany{\cup}{#1}{#2}{#3} }