+\usepackage{amssymb} % \succcurlyeq and friends
+
+\input{mjo-common}
+
+%
+% Common cones.
+%
+
+% The nonnegative orthant in the given number of dimensions.
+\newcommand*{\Rnplus}[1][n]{ \Rn[#1]_{+} }
+
+% The Lorentz ``ice-cream'' cone in the given number of dimensions.
+\newcommand*{\Lnplus}[1][n]{ \mathcal{L}^{{#1}}_{+} }
+
+% The PSD cone in a space of symmetric matrices.
+\newcommand*{\Snplus}[1][n]{ \mathcal{S}^{{#1}}_{+} }
+
+% The PSD cone in a space of Hermitian matrices.
+\newcommand*{\Hnplus}[1][n]{ \mathcal{H}^{{#1}}_{+} }
+
+
+%
+% Some collections of linear operators
+%
+