Re: [請益] beamer multirow vdots

Here is one solution where I modify the definition of \vdots in TeX and 

give it a name \vdotspan in which the pt size is manipulated

if multirow is 3, 4, or 5 you may need to try the pt size again. 

or make a macro out of this. I will leave it to you.

If you do make a macro, please share your achievement here with others

---------------
\documentclass{article}

\usepackage{multirow}

\def\vdotspan{\vbox{
      \baselineskip = 4pt\relax
      \advance\baselineskip by 4pt\relax
      \lineskiplimit = 0pt\relax
      \kern 4pt\relax
      \hbox {.}\hbox {.}\hbox {.}
      }}


\begin{document}

\begin{tabular}{|c|c|c|}
\multirow{2}{*}{\vdotspan}
&A &B \\
& C&D
\end{tabular}

\end{document}