[Tex/LaTex] I want the QED symbol to be 1 line lower at the end of proof

amsthm

Just as my title says, I would prefer to have my qed symbol to be 1 line lower than the last line of my proof. By default its on the same line and aligned to the right.

How can I achieve this?

EDIT: See below code for an example:

\documentclass[11pt,a4paper]{article}
\usepackage[margin=3cm]{geometry}
\usepackage[english]{babel}
\usepackage{amsmath, amsthm}
\begin{document}

\begin{proof}
    Hello there good chap! I'll put in another line here just to be sure its clear what I mean.
\end{proof}



\end{document}

Best Answer

Add the following lines in your preamble:

\usepackage{etoolbox}
\patchcmd{\endproof}
  {\popQED}
  {\par\popQED}
  {}
  {}

In this way we patch the proof environment (its end part \endproof) to issue a \par before printing the qed symbol.

Complete MWE:

\documentclass[11pt,a4paper]{article}
\usepackage[margin=3cm]{geometry}
\usepackage[english]{babel}
\usepackage{amsmath, amsthm}

\usepackage{etoolbox}
\patchcmd{\endproof}
  {\popQED}
  {\par\popQED}
  {}
  {}

\begin{document}

\begin{proof}
    Hello there good chap! I'll put in another line here just to be sure its clear what I mean.
\end{proof}

\end{document}

Output:

enter image description here

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