EDB — 1Z2

\begin{eqnarray} \label{eq:limsup_ insiemi} \limsup _{n→∞} A_ n {\stackrel{.}{=}}⋂_{n=1}^∞ ⋃_{k=n}^∞ A_ k\\ {} \label{eq:liminf_ insiemi} \liminf _{n→∞} A_ n {\stackrel{.}{=}}⋃_{n=1}^∞ ⋂_{k=n}^∞ A_ k\\ {} \end{eqnarray}