− | x_{t+1}=Ax_t+\varepsilon_t, A\in\mathcal{R}^{n\times n}, \varepsilon_t\sim\mathcal{N}(0,\Sigma), ${\rm rk}(A)={\rm rk}(\Sigma)=n$ | + | x_{t+1}=Ax_t+\varepsilon_t, A\in\mathcal{R}^{n\times n}, \varepsilon_t\sim\mathcal{N}(0,\Sigma), ${\rm rk}(A)={\rm rk}(\Sigma)=n |