
#include <nag.h>

$$\leftE\right\le c\left(n\right)\epsilon \left{U}^{\mathrm{H}}\right\leftU\right\text{,}$$ 
$$A=\left(\begin{array}{rrrr}3.23+0.00i& 1.511.92i& 1.90+0.84i& 0.42+2.50i\\ 1.51+1.92i& 3.58+0.00i& 0.23+1.11i& 1.18+1.37i\\ 1.900.84i& 0.231.11i& 4.09+0.00i& 2.330.14i\\ 0.422.50i& 1.181.37i& 2.33+0.14i& 4.29+0.00i\end{array}\right)\text{.}$$ 