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amsmath 中的复选标记错误

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amsmath 中的复选标记错误

这一页说amsmath支持该\checkmark符号。然而，当我尝试实现这个

\documentclass[12pt]{article}
\usepackage{amsmath}
\begin{document}

$\checkmark$

\end{document}

TeXWorks 给出了错误

! Undefined control sequence.
recently read> \checkmark

这里可能存在什么问题？谢谢大家。

答案1

该页面有误。那里列出的所有符号名称均来自amsfonts。

原始实现amsmath（然后amstex.sty在非乳胶原件后调用）已加载amsfonts，但amsmath没有。来自文件amsmath.dtx：

%    A \latex/ package named \pkg{amstex} was created in 1988--1989 by
%    adapting \fn{amstex.tex} for use within \latex/. The \pkg{amsmath}
%    package is the successor of the \pkg{amstex} package. It was
%    substantially overhauled to integrate it with \latex/2e, which
%    arrived on the scene in 1994. It provides more or less the same
%    features, but there are quite a few organizational differences as
%    well as some new features and bug fixes. For example, the
%    \pkg{amstex} package automatically loaded the \pkg{amsfonts}
%    package, but the \pkg{amsmath} package does not. At the present
%    time (November 1999) user-level documentation of the commands
%    provided here is found in the AMSmath Users' Guide,
%    \fn{amsldoc.tex}.

因此有必要\usepackage{amsfonts}访问\checkmark。所引用页面的其余大部分内容都指定了amssymb，这是正确的；会自动amssymb 加载amsfonts，因此如果需要附加符号，则无需同时指定两者。

您知道谁负责该页面吗？最好让他们知道应该更正/更新。

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