
#include <nag.h>

$$\leftE\right\le c\left(n\right)\epsilon \left{U}^{\mathrm{T}}\right\leftU\right\text{,}$$ 
$$A=\left(\begin{array}{cccc}4.16& 3.12& 0.56& 0.10\\ 3.12& 5.03& 0.83& 1.18\\ 0.56& 0.83& 0.76& 0.34\\ 0.10& 1.18& 0.34& 1.18\end{array}\right)\text{,}$$ 