Bracket problem with \newtheorem

Question

\documentclass[a4paper, 11pt, notitlepage]{report}
\usepackage{amsthm}
\theoremstyle{plain}
\newtheorem{thm}{Theorem}[section] % reset theorem numbering for each chapter
\theoremstyle{definition}
\newtheorem{props}[thm]{Proposition}

\begin{document}
\begin{props} [[1], p. 180]
\end{props}
\end{document}

The result would be:

Proposition 0.0.1 ([1). , p. 180]

How do I make it like this:

Proposition 0.0.1 ([1], p. 180)

I'm using TeXStudio with XeLaTeX.

Answer 1

You could load the mathtools package and use its commands \lbrack and \rbrack -- note that they need to be used in math mode -- to typeset square brackets in a way that doesn't trip up LaTeX. I.e., you'd write

\begin{props}[$\lbrack 1\rbrack]$, p.~180]

Addendum: I just noticed the comment posted by @Bernard: An even easier solution is to write

\begin{props}[{[1]}, p.~180]

---

Presumably, though, the [1] element is a call-out to an entry in the bibliography. Have you tried \begin{props}[\cite{whatever}, p.~180], where "whatever" is the citation key of the entry in question? Assuming you're using a numeric citation style, the \cite command will generate the [1] element for you in a way that doesn't interfere with \begin{props}.