[Tex/LaTex] the Latex code for making many vertical dots in math mode

Question

I need them going all the way down but the colon only gives me 2 dots and if I put another colon on the next line, a gap appears between them. Basically need to show a table continuation with …… but vertically.

Answer 1

Maybe something like this can help. Otherwise you probably need to elaborate a bit on the question formulation, it is not really clear how the dots should be used.

The idea is to use \dotfill to get a (horizontal) line of dots of a certain length. Then use \rotatebox to turn it vertically. The \raisebox lifts it 1em over the baseline. When using it \strut\rlap{\rule{5em}{0.1pt}} prints a thin line along the baseline. To get a specific number of dots try to trim the length of line.

\documentclass{article}
\usepackage{graphicx}
\newcommand\longvdots[1]{\raisebox{1em}{\rotatebox{-90}{\hbox to #1 {\dotfill}}}}
\begin{document}
\strut\rlap{\rule{5em}{0.1pt}} a \longvdots{3em} b
\end{document}