\documentclass[10pt]{beamer}
\usepackage[orientation=landscape,
size=custom,width=32,height=18.0,scale=.75]{beamerposter}
% 設定紙張大小
\title{symbol-table}
\begin{document}
\begin{frame}
\begin{tabular}{ll}
$\leq$ & $\backslash$leq \\
$\geq$ & $\backslash$geq \\
$\neq$ & $\backslash$neq \\
$\nleq$ & $\backslash$nleq \\
$\ngeq$ & $\backslash$ngeq \\
$\cong$ & $\backslash$cong \\
$\equiv$ & $\backslash$equiv \\
$\sim$ & $\backslash$sim \\
$\approx$ & $\backslash$approx \\
$\doteqdot$ & $\backslash$doteqdot \\
$\times$ & $\backslash$times \\
$\cdot $ & $\backslash$cdot \\
$\ast $ & $\backslash$ast \\
$\div$ & $\backslash$div \\
$\pm$ & $\backslash$pm \\
$\mp$ & $\backslash$mp \\
$\bigcirc$ & $\backslash$bigcirc \\
$\oplus$ & $\backslash$oplus \\
$\otimes$ & $\backslash$otimes \\
\end{tabular}
\hspace*{1ex}
\begin{tabular}{ll}
$\propto $ & $\backslash$propto \\
$\cdots $ & $\backslash$cdots \\
$\dots $ & $\backslash$dots \\
$\because$ & $\backslash$because \\
$\therefore$ & $\backslash$therefore \\
$\forall$ & $\backslash$forall \\
$\exists$ & $\backslash$exists \\
$\in$ & $\backslash$in \\
$\subset $ & $\backslash$subset \\
$\subseteq $ & $\backslash$subseteq \\
$\varnothing $ & $\backslash$varnothing \\
$\cap $ & $\backslash$cap \\
$\cup $ & $\backslash$cup \\
$\setminus $ & $\backslash$setminus \\
$\wedge $ & $\backslash$wedge \\
$\vee $ & $\backslash$vee \\
$\Rightarrow$ & $\backslash$Rightarrow \\
$\rightarrow$ & $\backslash$rightarrow \\
$\mapsto$ & $\backslash$mapsto \\
\end{tabular}
\hspace*{1ex}
\begin{tabular}{ll}
\$ & $\backslash$\$ \\
\& & $\backslash$\& \\
\% & $\backslash$\% \\
$\backslash$ & $\backslash$backslash \\
$\sharp$ & $\backslash$sharp \\
$\partial$ & $\backslash$partial \\
$90^\circ$ & 90$^\wedge\backslash$circ \\
$\parallel$ & $\backslash$parallel \\
$\bot$ & $\backslash$bot \\
$\triangle$ & $\backslash$triangle \\
$\nabla$ & $\backslash$nabla \\
$\square$ & $\backslash$square \\
$\angle$ & $\backslash$angle \\
$\Pi$ & $\backslash$Pi \\
$\Theta$ & $\backslash$Theta \\
$\Gamma$ & $\backslash$Gamma \\
$\Delta$ & $\backslash$Delta \\
$\Omega$ & $\backslash$Omega \\
$\Sigma$ & $\backslash$Sigma \\
\end{tabular}
\hspace*{1ex}
\begin{tabular}{ll}
$\alpha$ & $\backslash$alpha \\
$\beta$ & $\backslash$beta \\
$\epsilon$ & $\backslash$epsilon \\
$\zeta$ & $\backslash$zeta \\
$\eta$ & $\backslash$eta \\
$\kappa$ & $\backslash$kappa \\
$\lambda$ & $\backslash$lambda \\
$\mu$ & $\backslash$mu \\
$\xi$ & $\backslash$xi \\
$\rho$ & $\backslash$rho \\
$\tau$ & $\backslash$tau \\
$\phi$ & $\backslash$phi \\
$\psi$ & $\backslash$psi \\
$\pi$ & $\backslash$pi \\
$\theta$ & $\backslash$theta \\
$\gamma$ & $\backslash$gamma\\
$\delta$ & $\backslash$delta \\
$\omega$ & $\backslash$omega \\
$\sigma$ & $\backslash$sigma \\
\end{tabular}
\hspace*{1ex}
\begin{tabular}{ll}
$\infty$ & $\backslash$infty \\
$f\;' $ & f$\backslash$;$\prime$\\
$\int $ & $\backslash$int \\
$\oint $ & $\backslash$oint \\
$\mathbb{Z} $ & $\backslash$mathbb\{Z\} \\
$\mathbb{R} $ & $\backslash$mathbb\{R\} \\
$\mathbb{Q} $ & $\backslash$mathbb\{Q\} \\
$\sqrt[3]{2}$ & $\backslash$sqrt[3]\{2\} \\
$\frac{2}{3}$ & $\backslash$frac\{2\}\{3\} \\
$\lceil x \rceil$ & $\backslash$lceil x $\backslash$rceil \\
$\lfloor x \rfloor$ & $\backslash$lfloor x $\backslash$rfloor \\
$\{ x \}$ & $\backslash$\{ x $\backslash$\} \\
$\widehat{p} $ & $\backslash$widehat\{p\} \\
$\overline{AB} $ & $\backslash$overline\{AB\} \\
$\overleftrightarrow{AB} $ & {\scriptsize $\backslash$overleftrightarrow\{AB\} }\\
$\overset{\LARGE\frown}{\small{AB}} $ & {\scriptsize $\backslash$overset\{$\backslash$LARGE $\backslash$frown\}\{$\backslash$small\{AB\}\}}\\
%$\overrightharp{AB} $ & {\scriptsize $\backslash$overrightharp\{AB\} }*\\
%$\overset{\large \rightharpoonup}{\small{AB}} & {\scriptsize \overset{\large \rightharpoonup}{\small{AB}}}\\
%$\overset{\LARGE \frown}{\small{AB}}$ & {\scriptsize $\backslash$overset\{$\backslash$frown\}\{AB\}}\\
$ /\!\! /$ & / $\backslash$ ! $\backslash$ ! /\\
$\overset{\large \rightharpoonup}{\small{AB}}$ & {\scriptsize
$\backslash$overset\{$\backslash$large$\backslash$rightharpoonup\}\{$\backslash$small\{AB\}\} }
\end{tabular}
\end{frame}
\end{document}
