在定理或定义陈述中引用特定引文

Question

假设我想写一个我称之为 \cite{fr82} 的来源的定义 1.1。我可以\cite[Definition 1.1]{fr82}毫无困难地写，我可以写

\begin{defn}[\cite{fr82}]
blah blah
\end{defn}

没有任何麻烦。然而，当我写

\begin{defn}[\cite[Definition 1.1]{fr82}] blah blah
blah blah
\end{defn}

我收到以下错误：

Runaway argument?
Definition 1.1)
! Paragraph ended before \@citex was complete.
<to be read again> 
                   \par 
l.488 \begin{defn}[\cite[Definition 1.1]
                                        {fr82}]\label{defn:geom_fib}
I suspect you've forgotten a `}', causing me to apply this
control sequence to too much text. How can we recover?
My plan is to forget the whole thing and hope for the best

有什么办法可以修复此问题吗？

Answer 1

您需要将环境可选参数的内容括defn在花括号中。

\documentclass{article}

\usepackage{amsthm}
\theoremstyle{definition}
\newtheorem{defn}{Definition}

\usepackage[authoryear]{natbib}
\begin{document}

\begin{defn}[{\citealt[Definition 1.1]{sm82}}] 
Blah blah blah blah.
\end{defn}

\begin{thebibliography}{9}
\bibitem[Smith(1982)]{sm82} Smith, J., 1982, \dots
\end{thebibliography}
\end{document}