Scusami, ma non pensavo fosse significativo
`
\begin{equation}
\begin{split}
&\lim_{N \rightarrow \infty} \frac{1}{N} \cdot e_f(k+i) \cdot y_p(k-p+i)^T =\\
&= \left[
\begin{array}{cccc}
E \left( e_{k+i} \cdot {y_{k-p+i}}^T \right) & E \left( e_{k+i} \cdot {y_{k-p+i+1}}^T \right) & \cdots & E \left( e_{k+i} \cdot {y_{k+i-1}}^T \right)\\
E \left( e_{k+i+1} \cdot {y_{k-p+i}}^T \right) & E \left( e_{k+i+1} \cdot {y_{k-p+i+1}}^T \right) & \cdots & E \left( e_{k+i+1} \cdot {y_{k+i-1}}^T \right)\\
\vdots & \vdots & & \vdots\\
E \left( e_{k+f+i-1} \cdot {y_{k-p+i}}^T \right) & E \left( e_{k+f+i-1} \cdot {y_{k-p+i+1}}^T \right) & \cdots & E \left( e_{k+f+i-1} \cdot {y_{k+i-1}}^T \right)\\
\end{array}
\right] \\
\end{split}
\end{equation}
`