[Tex/LaTex] QED symbol on the same page as proof

amsthmpage-breakingtheorems

I'm using the proof environment from the amsthm package. In some cases, the last line of a proof falls at the end of a page, but the QED symbol (the little white box) ends up on the following page.

Is there any way to guarantee that in each instance of \begin{proof} ... \end{proof} in my document, the QED symbol will always be on the same page as the last line of the proof?

Here is an MWE which demonstrates this problem:

\documentclass{article}

\usepackage{lipsum}
\usepackage{amsthm}

\begin{document}

\begin{proof}

\lipsum[1-5]
This is the concluding line of the proof.

\end{proof}

This line is on the second page, below the QED symbol.

\end{document}

Best Answer

If you remove the blank line between This is the concluding line of the proof. and the \end{proof}, the problem disappears.

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