$$\xleftarrow{n=0}, \xrightarrow[T]{n>0}$$

\xleftarrow{n=0}, \xrightarrow[T]{n>0}

$$\max\limits_{x}$$

\max\limits_{x}

$$\LaTeX$$

\LaTeX

$$\textcircled{\texttt{7}}$$

\textcircled{\texttt{7}}