# Too much space below displayed equation in itemization when using \uncover in the equation

Anonymous created an issue

When a displayed equation (or, more usefully, parts of it) are revealed using \uncover, too much space is left below it before the next \item. Small example:

\documentclass{beamer} \usepackage[english]{babel}

\begin{document}

\end{document}

The vertical space below the second displayed equation is considerably larger than the vertical space below the first one.

I am the author of the previous post. I didn't intend to post anonymously. I also didn't understand how to show code nicely. Here is the code in my post:

\documentclass{beamer}
\usepackage[english]{babel}

\begin{document}

\begin{frame}
\begin{itemize}
\item
$x+y$
\item
$\uncover<1->{x+y}$
\end{itemize}
\end{frame}

\end{document}

• changed status to open

Not quite sure what is going on here: perhaps a box issue. Will try to track it down.

The problem comes about because a special (whatsit) is needed to do the hiding, and the one at the end of the display environment interferes with spacing. There isn't a good solution to this with the LaTeX2e kernel: one of the big drivers for me working on LaTeX3! As such, I don't thing there is a good solution at the beamer end: WONTFIX more out of frustration than anything wrong with the report!

Thanks for looking at the problem! (and more generally for working on a superb piece of software).