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表格错误；“有些不对劲——可能缺少 \item。”（没有 itemize 或 enumerate）

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表格错误；“有些不对劲——可能缺少 \item。”（没有 itemize 或 enumerate）

我知道这个问题和这个但我遇到的问题与章节标题无关，而且我没有使用 itemize 或 enumerate。所以它们对我没有帮助。如问题标题所示，错误消息（使用 pdflatex）是

! LaTeX Error: Something's wrong--perhaps a missing \item.

这是一份 Latex Beamer 文档；

\documentclass{beamer}

\usepackage{graphicx}
\usepackage{caption}
\usepackage{color}
\usepackage{amsmath}

\mode<presentation>
{    
  \usecolortheme{default} 
  \usefonttheme{default}  
  \setbeamertemplate{navigation symbols}{}
  \setbeamertemplate{caption}[numbered]
} 


\title[Such a title]{Title}
\author{Ron Weasley}
\institute{Hogwarts}
\date{19th of January 2017}

\begin{document}

\begin{frame}
  \titlepage
\end{frame}

\begin{frame}{Outline} %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
  \tableofcontents
\end{frame}

\section{Introduction} %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
\begin{frame}{Finding solutions}
Problem \(\rightarrow\) Formalism \(\rightarrow\) Result
\end{frame}


\section{Merits of Formalisms}

\begin{frame}{Instant form} %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
\begin{figure}
        \includegraphics[width=0.6\textwidth]{LightConeImages/InstantLightCone}
    \end{figure}
\end{frame}

\begin{frame}{Poincar\'e group in instant form} %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
\begin{tabular}{c c c}
    \(P^1\) & \(P^3\) & \(M^{12}\)\\
    \begin{figure}
        \includegraphics[width=0.3\textwidth]{LightConeImages/BackLightCone}
    \end{figure}
    &
    \begin{figure}
        \includegraphics[width=0.3\textwidth]{LightConeImages/RightLightCone}
    \end{figure}
    &
    \begin{figure}
        \includegraphics[width=0.3\textwidth]{LightConeImages/TurnLightCone}
    \end{figure}
    \\
\end{tabular}
\end{frame}


\end{document}

注释掉表格部分确实可以消除错误，所以我确定是这个。我该如何解决这个问题？

答案1

解决了问题；

\begin{tabular}{c c c}
    \(P^1\) & \(P^3\) & \(M^{12}\)\\
        \includegraphics[width=0.3\textwidth]{LightConeImages/BackLightCone}
    &
        \includegraphics[width=0.3\textwidth]{LightConeImages/RightLightCone}
    &
        \includegraphics[width=0.3\textwidth]{LightConeImages/TurnLightCone}
    \\
\end{tabular}

基本上，表格环境中不允许使用数字。 只使用\includegraphics数字。

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