# parskip messes with the vertical space between a theorem and its proof

Not sure why, but I usually prefer no parindent, so I have to make up with parskip. Perhaps its a bad decision, but I usually find it easier to read that way, especially online.

However, I recently noticed that with these settings, there's a vertical space between a theorem and its proof which is a bit too large to my taste. This is seen especially when there's a sequence of theorems and proofs, and these extra spaces "group" it wrong - a proof seems closer to the theorem below it.

Here's an example:

\documentclass[11pt]{article}
\usepackage{amsthm}
\usepackage{thmtools}
\declaretheorem[style=thm,parent=section]{theorem}
\parindent 0in
\parskip 1ex

\begin{document}
Some normal text.

Another paragraph.
\begin{theorem}
A theorem.
\end{theorem}
\begin{proof}
Its proof.
\end{proof}
\begin{theorem}
Another theorem.
\end{theorem}
\begin{proof}
Another proof.
\end{proof}
\end{document}


Produces:

Removing the parskip/parindent definitions produces this:

Theorems look better, but the paragraphs above (naturally) have no vertical space between them.

I can probably hack the proof theorem with thmtools, but I was wondering if this is the way to go (from a technical point of view, but also from a design point of view).

What do you think?

• the proof environment in amsthm is defined as a \trivlist, with the space above controlled by \topsep rather than \addvspace (which would be much easier to control). i've added this to the list of known problems to be investigated. – barbara beeton Nov 16 '16 at 15:08
• note if you just set parskip lots of "internal paragraphs" will be affected. The parskip package tries to adjust at least the more common ones. Also it's more normal t allow some glue stretch in parskip to help with page breaking. – David Carlisle Nov 16 '16 at 15:19