Math & Science ⇒ Flexibly start new page for proof environment

[MathDood]

I would like to redefine my proof environment so that if the content of the proof environment is only, say, 3 lines or fewer, then the entire proof environment will just start on a new page. Here is a MWE:

Code: Select all

\documentclass[11pt]{article}

\usepackage{lipsum}
\usepackage{amsthm}

\begin{document}

\lipsum[1-4]

\begin{proof}
\lipsum[1]
\end{proof}

\end{document}

In this case, there are only 2 lines of a proof on the first page, so I would like the new proof environment to automatically start the proof on the next page. If the proof environment contained 4 or more lines on a page, then it will behave as normal.

I found a thread on the TeX Stack Exchange where they gave an example of defining an environment with different spacing and page breaking rules, but I do not understand the solution well enough to adapt it to what I am trying to do with the proof environment.

[Stefan Kottwitz]

Hi MathDood,

that's possible using the needspace package. I described using it a bit: here.

You simply need to redefine the proof environment to insert a \needspace command at the beginning of that environment.

Stefan