diff -r 6a1b6c2de201 -r 787914e9e859 text/kw_macros.tex
--- a/text/kw_macros.tex	Fri May 27 21:54:22 2011 -0600
+++ b/text/kw_macros.tex	Sat May 28 09:49:30 2011 -0600
@@ -30,6 +30,7 @@
 \def\inv{^{-1}}
 \def\ol{\overline}
 \def\BD{BD}
+\def\bbc{{\mathcal{BBC}}}
 
 \def\spl{_\pitchfork}
 \def\trans#1{_{\pitchfork #1}}