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仅更改定理标题（括号部分）的颜色

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仅更改定理标题（括号部分）的颜色

使用 amsthm 包时，如何仅更改定理标题的颜色，即“定理”、“定义”等后面括号中的部分？

我曾尝试传递\color{red}定理头字体（见下文），但这也会改变第一部分，即不在括号中。

\newtheoremstyle{note}% (name)
    {}% (space above)
    {}% (space below)
    {}% (body font)
    {}% (indent amount)
    {\bfseries\color{red}}% (Theorem head font)
    {:}% (Punctuation after theorem head)
    {.5em}% (Space after theorem head)
    {}% (Theorem head spec (can be left empty, meaning ‘normal’))

澄清一下，当说

\begin{definition}[foo] an explanation \end{definition}

我只希望“foo”是红色的，但定义保持不变，因为我已经在定理头字体中对它进行了定义。

答案1

您可以为此使用 的最后一个参数。 、和\newtheoremstyle的参数仅在相关字段存在时才打印。\thmname\thmnumber\thmnote

\documentclass{article}

\usepackage{amsthm}
\usepackage{xcolor}

\newtheoremstyle{note}% (name)
    {}% (space above)
    {}% (space below)
    {}% (body font)
    {}% (indent amount)
    {\bfseries}% (Theorem head font)
    {:}% (Punctuation after theorem head)
    {.5em}% (Space after theorem head)
    {\thmname{#1}\thmnumber{ #2}\thmnote{ (\textcolor{red}{#3})}}
    % ^^(Theorem head spec (can be left empty, meaning ‘normal’))

\theoremstyle{note}
\newtheorem{theorem}{Theorem}

\begin{document}

\begin{theorem}[Named theorem]
    This theorem has a name.
\end{theorem}

\begin{theorem}
    This theorem does not.
\end{theorem}

\end{document}

输出

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