
#include <nag.h>

$$\leftE\right\le c(k+1)\epsilon \left{U}^{\mathrm{T}}\right\leftU\right\text{,}$$ 
$$A=\left(\begin{array}{cccc}5.49& 2.68& 0.00& 0.00\\ 2.68& 5.63& 2.39& 0.00\\ 0.00& 2.39& 2.60& 2.22\\ 0.00& 0.00& 2.22& 5.17\end{array}\right)\text{.}$$ 