Formula_7711

\[\begin{gathered}T_{v}=\left[a_{1}, z_{1}\right] \times \ldots \times\left[a_{v-1}, z_{v-1}\right] \times \Delta_{v} \times\left[a_{v+1}, z_{v+1}\right] \times \ldots \times\left[a_{n}, z_{n}\right], \\v=1,2, \ldots, n,\end{gathered}\]