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diff --git a/mjo-cone.tex b/mjo-cone.tex
index c556f4b..6c681e9 100644
--- a/mjo-cone.tex
+++ b/mjo-cone.tex
@@ -11,7 +11,7 @@
 
 % The dual of a subset of an inner-product space; always a closed
 % convex cone.
-\newcommand*{\dual}[1]{ {#1}^{*} }
+\newcommand*{\dual}[1]{ #1^{*} }
 
 %
 % Common cones.
@@ -59,6 +59,8 @@
 % The space of Lyapunov-like operators on its argument.
 \newcommand*{\LL}[1]{ \mathbf{LL}\of{ {#1} } }
 
+% The Lyapunov rank of the given cone.
+\newcommand*{\lyapunovrank}[1]{ \beta\of{ {#1} } }
 
 %
 % Cone inequality operators.