Regards,
Ash
Code: Select all
\documentclass[a4paper,12pt, final]{article}
\usepackage{amsmath}
\usepackage[margin=2.54cm,top=2.54cm]{geometry}
\usepackage{hyperref}
\usepackage{amsmath}
\usepackage{amssymb}
\begin{document}
\begin{align*}
& \quad \text{ }\underset{\downarrow }{1}\quad \underset{\downarrow }{k}%
\qquad \underset{\downarrow }{x}\ \underset{\downarrow }{i} \\
H=& \left[
\begin{array}{cccc}
1 & 0 & 0 & 0 \\
0 & 1 & 0 & 0 \\
0 & 0 & 1 & 0 \\
0 & 0 & 0 & 1 \\
1 & 0 & 0 & 0 \\
0 & \left( 1-\rho \right) & 0 & 1 \\
0 & 0 & \rho & 0%
\end{array}
\right]
\begin{array}{c}
\leftarrow 1 \\
\leftarrow k \\
\leftarrow x \\
\leftarrow i \\
\leftarrow 1 \\
\leftarrow k^{\prime } \\
\leftarrow x^{\prime }%
\end{array}
\end{align*}
\end{document}