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\be

\item $x \in S$, $x \notin S$.

\item $A \cap B$, $A \cup B$.

\item $f \circ g$.

\item $\lfloor x \rfloor$, $\lceil x \rceil$.

\item $x \approx 3$.

\item $x \neq 3$.

\item $a \wedge b$, $a \vee b$.

\item $\vec{a} \times \vec{b}$.

\item $\langle a, b \rangle$.

\item $\|x\|_{\infty}$.

\item $\exists x$, $\forall x$.

\item $\leftarrow$, $\longleftarrow$, $\Leftarrow$, $\Longleftarrow$.

\item $\pm, \mp$.

\item $a \in \Z, ~b \in \R,  ~c \in \N, ~d \in \Q, ~e \in \C$.

\item $\sinc(x)$.

\item Jos\'e.

\ee

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