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在 savebox 环境中数学字体排版不同

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在 savebox 环境中数学字体排版不同

当我在 savebox 环境中和主文档中使用 beamer 排版相同的方程式时，用于数学方程式的字体会有所不同。

下面是显示差异的 MWE。

\documentclass{beamer}

\newcommand{\delsq}[2]{
  \frac{\partial^2 {#1}}{\partial {#2}^2}
}
\newcommand{\deldel}[2]{
  \frac{\partial #1}{\partial #2}
}

\newcommand{\waveEqOneD}{\delsq{u}{t} = c^2\delsq{u}{x}}

\newsavebox{\waveEquationTest}
\savebox{\waveEquationTest}{
  $\begin{array}{ll}
    u(0,t)=0 & u(L,t)=0\\
    u(x,0)=f(x) & \deldel{u}{t}(x,0)=g(x)\\
  \end{array}$
}
%%%%%%%%%%%%%%%%%%%%%%%%%%%%
% Begin document           %
%%%%%%%%%%%%%%%%%%%%%%%%%%%%
\begin{document}
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
\begin{frame}{Boundary conditions}
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
  \usebox{\waveEquationTest}
  $\begin{array}{ll}
    u(0,t)=0 & u(L,t)=0\\
    u(x,0)=f(x) & \deldel{u}{t}(x,0)=g(x)\\
  \end{array}$
\end{frame}
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
\end{document}
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%

savebox环境内外使用相同的代码，但是呈现代码的字体不同。

我的问题是为什么这些排版不同？

其次，我其实更喜欢斜体字体里面savebox 环境。如何才能将其设为整个演示文稿中的默认数学字体？

答案1

该类beamer重新定义了 中的部分字体\begin{document}。这样它就可以支持在 之后的序言中加载的字体包\documentclass。如果您将 移出\savebox序言，它会看到beamer数学字母已更改为无衬线斜体并使用与其他数学相同的字体。

\documentclass{beamer}

\newcommand{\delsq}[2]{
  \frac{\partial^2 {#1}}{\partial {#2}^2}
}
\newcommand{\deldel}[2]{
  \frac{\partial #1}{\partial #2}
}

\newcommand{\waveEqOneD}{\delsq{u}{t} = c^2\delsq{u}{x}}

\newsavebox{\waveEquationTest}

%%%%%%%%%%%%%%%%%%%%%%%%%%%%
% Begin document           %
%%%%%%%%%%%%%%%%%%%%%%%%%%%%
\begin{document}

\savebox{\waveEquationTest}{
  $\begin{array}{ll}
    u(0,t)=0 & u(L,t)=0\\
    u(x,0)=f(x) & \deldel{u}{t}(x,0)=g(x)\\
  \end{array}$
}

%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
\begin{frame}{Boundary conditions}
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
  \usebox{\waveEquationTest}
  $\begin{array}{ll}
    u(0,t)=0 & u(L,t)=0\\
    u(x,0)=f(x) & \deldel{u}{t}(x,0)=g(x)\\
  \end{array}$
\end{frame}
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
\end{document}
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%

如果您在序言中定义了 ，则将使用 中的\savebox默认衬线字体 (Computer Modern Roman Italic)。我建议您beamer通过添加以下行来设置字体

\usepackage{unicode-math}

并在 LuaLaTeX 中进行编译。如果beamer看到unicode-math，它会关闭对数学字体的重新定义并使用您选择的数学字体。如果您正在编写beamer演示文稿，您的出版商不会强迫您使用 PDFTeX 和旧字体。然后，您可以设置您选择的任何 OpenType 字体，例如\usepackage{newcomputermodern}默认 TeX 字体的稍暗克隆。

不过，与 PDFTeX 兼容的方法是添加

\usefonttheme{serif}

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