%
% The nonnegative orthant in the given number of dimensions.
-\newcommand*{\Rnplus}[1][n]{ \mathbb{R}^{{#1}}_{+} }
+\newcommand*{\Rnplus}[1][n]{ \Rn[#1]_{+} }
% The Lorentz ``ice-cream'' cone in the given number of dimensions.
\newcommand*{\Lnplus}[1][n]{ \mathcal{L}^{{#1}}_{+} }