# multicol interline space problems

I'm trying to create a template for exam forms, where you have a limited space and usually you want to fir as many formulas as you can. So I'm using multicol package for dividing by three the usual space. But I find problems with the interline space in different colums:

\documentclass[a4paper,10pt]{article}

\usepackage{multicol}       %Múltiples columnas
\usepackage[top=0.8cm,bottom=0.8cm,left=0.8cm,right=0.8cm,columnsep=14pt]{geometry}  %Ajuste fácil de dimensiones

\setlength{\parindent}{0pt}

\newcommand{\f}{\textbullet \ \ #1 \\
\vspace{0mm}
$#2$ \\}

\begin{document}

\footnotesize

\begin{multicols*}{3}

\f{Schrodinger Equation}{$a = x^2$}
\f{H definition}{$H = a \cdot b$}

\vfill

\centering{.}
\columnbreak

\f{Lorem impsum}{$v_e = 0$}

\vfill   %No quitar esto. Modula la altura de las columnas

.
\columnbreak
\textbf{Something} \\
\f{n values}{$n = 1,2,...,\infty$}

\end{multicols*}
\end{document}


And the result is: Where you can see that the space bewteen lines changes from the first to the other columns. How can I make that red spaces like the green one?

Thanks a lot, sorry because of my bad english...

• never use \\  at the end of a paragraph, also what is the intention of \vspace{0pt}, why add a zero space? \centering{.} sets up centering for the rest of the document, was that intended? (It does not take an argument) – David Carlisle Dec 14 '18 at 23:51

Underfull \hbox (badness 10000) in paragraph at lines 19--20

I also removed one set of $ your equations were set in display math, as surrounded by $$...$$ but very strangely marked up with the outer $ being supplied by the \f command and the inner $ being in the argument. If you do want math displays just replace $...$ in each argument by [...] \documentclass[a4paper,10pt]{article} \usepackage{multicol} %Múltiples columnas \usepackage[top=0.8cm,bottom=0.8cm,left=0.8cm,right=0.8cm,columnsep=14pt]{geometry} %Ajuste fácil de dimensiones \setlength{\parindent}{0pt} \newcommand{\f}{\par\textbullet\quad #1\par #2\par \medskip} \begin{document} \footnotesize \begin{multicols*}{3} \f{Schrodinger Equation}{$a = x^2$} \f{H definition}{$H = a \cdot b$} \vfill \mbox{}%???\centering{.} \columnbreak \f{Lorem impsum}{$v_e = 0$} \vfill %No quitar esto. Modula la altura de las columnas . \columnbreak \textbf{Something} \f{n values}{$n = 1,2,...,\infty\$}
`