I have written a simple enumeration with some formulas inside. I don't understand why in some items the square parenthesis are bigger than in other items. How can I tell tex to make all of the same size? I prefer the smaller ones. I don't want to replace \left( \right) with \big( \big) or something similar, because I would like all parenthesis to behave the same way automatically.
Here the code
\begin{enumerate}
\item se $x \in \left[\frac{1}{2},\frac{2}{3}\right]$, allora $F(x) \in A$;
\item se $n \in \mathbb{Z}_{\geq 2}$ e $x \in \left]\frac{n}{n+1},\frac{n+1}{n+2}\right[$, allora $F(x) \in \left]\frac{1}{n+1},\frac{1}{n}\right[$;
\item se $x \in \left[\frac{1}{3},\frac{1}{2}\right[$, allora $F(x) \in A$;
\item se $n \in \mathbb{Z}_{\geq 3}$ e $x \in \left]\frac{1}{n+1},\frac{1}{n}\right[$, allora $F(x) \in \left]\frac{1}{n},\frac{1}{n-1}\right[$.
\end{enumerate}
\left[...\right]
adjusts automatically to the height of the contents, i.e. the fractions, but I wonder about the output of your code. Shouldn't the brackets around the fractions have the same size?