我在外部宏中有一小段文字 \SomeText，我想将其排版为无衬线字体。但是，由于我没有处于数学模式，因此\sffamily\SomeText不会更改数学字体，并且\sffamily\mathsf{\SomeText}不起作用。
那么，无论是否包含数学内容，我该如何用无衬线字体排版材料呢？
\documentclass{article}
\usepackage{lmodern}
\newcommand{\SomeText}{This is some ($words \geq 5$) Text with math stuff in it: $a^2+b^2=c^2$}
\begin{document}
\begin{description}
\item[Roman:] \SomeText
\item[Sans:] {\sffamily \SomeText \\ (however, the math is still Roman)}
% LaTeX Error: \mathsf allowed only in math mode
% \item[AllSans:] {\sffamily\mathsf \SomeText}
\end{description}
\end{document}
答案1
好的，我在发布问题后很短的时间内找到了解决方案：该sansmath包\sansmath为此目的提供了命令（和几个环境）。
我仍然很好奇是否存在某种不依赖于附加包的解决方案。
\documentclass{article}
\usepackage{lmodern}
\usepackage{sansmath}
\newcommand{\SomeText}{This is some text with math stuff in it.
$x>5$, $a^2+b^2=c^2$}
\begin{document}
\begin{description}
\item[Roman:] \SomeText
\item[Sans:] {\sffamily \SomeText \\ However, the math is still Roman.}
\item[AllSans:] {\sffamily\sansmath \SomeText}
\end{description}
\end{document}
答案2
看一下让 mathfont 尊重周围的家庭。您将在那里找到改变数学字母表的解决方案，并让普通字体切换（如\sffamily）也改变数学字体。
摘自：
\documentclass[parskip=half]{scrartcl}
\usepackage[T1]{fontenc}
\usepackage{lmodern}
\DeclareMathVersion{sans}
\SetSymbolFont{operators}{sans}{OT1}{cmbr}{m}{n}
\SetSymbolFont{letters}{sans}{OML}{cmbrm}{m}{it}
\SetSymbolFont{symbols}{sans}{OMS}{cmbrs}{m}{n}
\SetMathAlphabet{\mathit}{sans}{OT1}{cmbr}{m}{sl}
\SetMathAlphabet{\mathbf}{sans}{OT1}{cmbr}{bx}{n}
\SetMathAlphabet{\mathtt}{sans}{OT1}{cmtl}{m}{n}
\SetSymbolFont{largesymbols}{sans}{OMX}{iwona}{m}{n}
\DeclareMathVersion{boldsans}
\SetSymbolFont{operators}{boldsans}{OT1}{cmbr}{b}{n}
\SetSymbolFont{letters}{boldsans}{OML}{cmbrm}{b}{it}
\SetSymbolFont{symbols}{boldsans}{OMS}{cmbrs}{b}{n}
\SetMathAlphabet{\mathit}{boldsans}{OT1}{cmbr}{b}{sl}
\SetMathAlphabet{\mathbf}{boldsans}{OT1}{cmbr}{bx}{n}
\SetMathAlphabet{\mathtt}{boldsans}{OT1}{cmtl}{b}{n}
\SetSymbolFont{largesymbols}{boldsans}{OMX}{iwona}{bx}{n}
\newif\IfInSansMode
\let\oldsf\sffamily
\renewcommand*{\sffamily}{\oldsf\mathversion{sans}\InSansModetrue}
\let\oldbf\bfseries
\renewcommand*{\bfseries}{\oldbf\IfInSansMode\mathversion{boldsans}\else\mathversion{bold}\fi\relax}
\let\oldnorm\normalfont
\renewcommand*{\normalfont}{\oldnorm\InSansModefalse\mathversion{normal}}
\let\oldrm\rmfamily
\renewcommand*{\rmfamily}{\oldrm\InSansModefalse\mathversion{normal}}
\usepackage[textwidth=9cm]{geometry}
\begin{document}
\section{Inline-$m\alpha \tau h$}
Normal: A $Ax\alpha+\chi b$
\sffamily Sans: A $Ax\alpha+\chi b$
\bfseries Bold-Sans: A $ Ax\alpha+\chi b$
\normalfont Normal: A $ Ax\alpha+\chi b$
\bfseries Bold: A $ Ax\alpha+\chi b$
\normalfont Normal: A $ Ax\alpha+\chi b$
\section{Display-$\mu\alpha\tau\eta$}
Text in roman family
\begin{equation}
\sqrt{(a_1+a_2+\gamma)^2}=\sum_{i=1}^2 a_i + \gamma
\end{equation}
\sffamily
Text in sans family
\begin{equation}
\sqrt{(a_1+a_2+\gamma)^2}=\sum_{i=1}^2 a_i + \gamma
\end{equation}
\sffamily\bfseries
Text in sans family, bold version
\begin{equation}
\sqrt{(a_1+a_2+\gamma)^2}=\sum_{i=1}^2 a_i + \gamma
\end{equation}
\rmfamily\bfseries
Text in roman family, bold version
\begin{equation}
\sqrt{(a_1+a_2+\gamma)^2}=\sum_{i=1}^2 a_i + \gamma
\end{equation}
\end{document}
答案3
除了@Tobi 的出色回答之外，如果您需要使用 helvetica 作为无衬线字体：
\DeclareMathVersion{sans}
\SetSymbolFont{operators}{sans}{OT1}{cmsmf}{m}{n}
\SetSymbolFont{letters}{sans}{OML}{cmssm}{m}{it}
\SetSymbolFont{symbols}{sans}{OMS}{cmsssy}{m}{n}
\SetMathAlphabet{\mathit}{sans}{OT1}{cmssm}{m}{sl}
\SetMathAlphabet{\mathbf}{sans}{OT1}{cmsssy}{bx}{n}
\SetMathAlphabet{\mathtt}{sans}{OT1}{cmssex}{m}{n}
\SetSymbolFont{largesymbols}{sans}{OMX}{cmssex}{m}{n}
（取自sansmathfonts.sty包sansmathfonts）。然后将其与排版的文本混合\fontfamily{phv}\selectfont\mdseries（记住仍然用于\sffamily数学）
例子：
