\footnote 只显示数字，底部没有内容

Question

我只是想使用 \footnote 显示参考资料。但是，投影仪只显示脚注的数量，而底部没有内容。这是我的代码

\frame{
    \frametitle{Motivation}
    %\begin{figure}
%        \centering
%        \includegraphics[width=2.5in]{figs/MTC.eps}
%        %\caption{}\label{}
%    \end{figure}
    \begin{itemize}
      \item [\small$\square$] Internet of Things (IoT) networks
      \begin{itemize}
         \item [$\blacktriangleright$] Massive access: the number of devices $k$ may be comparable to the coding blocklength $n$ \footnote{X. Chen, T.-Y. Chen, and D. Guo, ``Capacity of Gaussian many-access channels,'' \emph{IEEE Trans. Inform. Theory}, vol. 63, no. 6, pp. 3516-3539, Jun. 2017.},
         \begin{itemize}
           \item  Conventional MAC: $\lim_{k\rightarrow\infty}\lim_{n\rightarrow\infty} \mathrm{Capacity}(k,n)$
           \item  Massive access channels: $\lim_{n\rightarrow\infty} \mathrm{Capacity}(k_{n})$
         \end{itemize}
         \item [$\blacktriangleright$] Massive capacity: fiber-like user experience. Multiple antennas system
should be considered in the future wireless network.
      \end{itemize}
    \end{itemize}
}

和此代码的侧面

Answer 1

包含完整文件后，引用会按照我的机器（Linux，TeXLive 2018，lualatex）的预期出现在脚注中：

\documentclass{beamer}
\begin{document}
\frame{
    \frametitle{Motivation}
    %\begin{figure}
%        \centering
%        \includegraphics[width=2.5in]{figs/MTC.eps}
%        %\caption{}\label{}
%    \end{figure}
    \begin{itemize}
      \item [\small$\square$] Internet of Things (IoT) networks
      \begin{itemize}
         \item [$\blacktriangleright$] Massive access: the number of devices $k$ may be comparable to the coding blocklength $n$ \footnote{X. Chen, T.-Y. Chen, and D. Guo, ``Capacity of Gaussian many-access channels,'' \emph{IEEE Trans. Inform. Theory}, vol. 63, no. 6, pp. 3516-3539, Jun. 2017.},
         \begin{itemize}
           \item  Conventional MAC: $\lim_{k\rightarrow\infty}\lim_{n\rightarrow\infty} \mathrm{Capacity}(k,n)$
           \item  Massive access channels: $\lim_{n\rightarrow\infty} \mathrm{Capacity}(k_{n})$
         \end{itemize}
         \item [$\blacktriangleright$] Massive capacity: fiber-like user experience. Multiple antennas system
should be considered in the future wireless network.
      \end{itemize}
    \end{itemize}
}
\end{document}

亲切的问候，

恩斯特

Answer 2

完成代码片段以完成小文档后，您的脚注将出现在框架的底部（使用 MikTeX 编译并使用软件包的最新版本beamer）：

\documentclass{beamer}
\usepackage{amssymb}
%----
\setbeamertemplate{itemize item}{\small$\square$}
\setbeamertemplate{itemize subitem}[triangle]
\setbeamertemplate{itemize subsubitem}[circle]
%
\setbeamerfont{footnote}{size=\scriptsize}

\begin{document}
\begin{frame}
\frametitle{Motivation}
    \begin{itemize}
\item Internet of Things (IoT) networks
        \begin{itemize}
    \item  Massive access: the number of devices $k$ may be comparable to the coding blocklength $n$
            \footnote{X. Chen, T.-Y. Chen, and D. Guo, ``Capacity of Gaussian many-access channels,'' \emph{IEEE Trans. Inform. Theory}, vol. 63, no. 6, pp. 3516-3539, Jun. 2017.},
            \begin{itemize}
       \item  Conventional MAC: $\lim_{k\to\infty}\lim_{n\to\infty} \mathrm{Capacity}(k,n)$
       \item  Massive access channels: $\lim_{n\to\infty} \mathrm{Capacity}(k_{n})$
            \end{itemize}
    \item  Massive capacity: fiber-like user experience. Multiple antennas system should be considered in the future wireless network.
        \end{itemize}
  \end{itemize}
\end{frame}
\end{document}

题外话：观察列表的使用方式和beamertemplate序言中 s 的定义的差异。这样，你的整个演示都会更加一致。