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“粗体版本中的数学字母太多”错误

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“粗体版本中的数学字母太多”错误

我很难“粗体版本中的数学字母太多”错误。这是最新版本的 Texlive 附带的最小工作示例Ubuntu 18.04：

\documentclass[11pt]{article}
\usepackage{amsmath}
\usepackage{amssymb}
\begin{document}

$\widetilde{\boldsymbol{\mathsf{x}}}_n$
\begin{equation}
\widetilde{\boldsymbol{\mathsf{x}}}_n
\end{equation}

\end{document}

我一直在寻找，但找不到导致错误的原因。似乎同时存在\widetilde{\boldsymbol{\mathsf{x}}}_n内联和显示的方程式会导致此错误，但我完全不知道为什么以及如何修复此错误 :-(。

我的问题： 有没有办法来解决这个问题？

非常感谢任何帮助/提示。

PS 1：此错误似乎与 “数学字母太多”错误 所以我相信它不是重复的。

PS 2：正如 David Carlisle 在评论中指出的那样，日志文件中的第一个错误是

! Use of \reserved@a doesn't match its definition.
\reserved@b ->\relax \ifmmode \else \non@alpherr \mathsf  \fi \use@mathgroup

答案1

我认为你只需要这个修复

\documentclass[11pt]{article}
\usepackage{amsmath}
\usepackage{amssymb}
\makeatletter
\def\@mathmeasure#1#2#3{\setbox#1\hbox{%
  \m@th$#2#3$}}
\makeatother
\begin{document}
$\widetilde{\boldsymbol{\mathsf{x}}}_n$
\begin{equation}
\tracingall
\widetilde{\boldsymbol{\mathsf{x}}}_n
\end{equation}

\end{document}

注意当前 amsmath 来源说

%    As of 2018/12 release we don't turn off |\evermath| as this
%    optimization can be harmful.
% \changes{v2.17b}{2018/12/01}{Don't drop \cs{frozen@everymath}}

那可能是我，但我不记得了，也许是弗兰克:-)

作为基本规则仅有的查看报告的第一个错误。数学字母错误完全是虚假的，但要得到它，您需要超过 18！！！！早期的错误消息：

! Use of \reserved@a doesn't match its definition.
\reserved@b ->\relax 
                     \ifmmode \else \non@alpherr \mathsf  \fi \use@mathgroup...
l.8 \widetilde{\boldsymbol{\mathsf{x}}}
                                       _n
? 
! Undefined control sequence.
<argument> \@nil 
                 
l.8 \widetilde{\boldsymbol{\mathsf{x}}}
                                       _n
? 
! Use of \reserved@a doesn't match its definition.
\reserved@b ->\relax 
                     \ifmmode \else \non@alpherr \mathsf  \fi \use@mathgroup...
l.8 \widetilde{\boldsymbol{\mathsf{x}}}
                                       _n
? 
! Undefined control sequence.
<argument> \@nil 
                 
l.8 \widetilde{\boldsymbol{\mathsf{x}}}
                                       _n
? 
! Use of \reserved@a doesn't match its definition.
\reserved@b ->\relax 
                     \ifmmode \else \non@alpherr \mathsf  \fi \use@mathgroup...
l.8 \widetilde{\boldsymbol{\mathsf{x}}}
                                       _n
? 
! Undefined control sequence.
<argument> \@nil 
                 
l.8 \widetilde{\boldsymbol{\mathsf{x}}}
                                       _n
? 
! Use of \reserved@a doesn't match its definition.
\reserved@b ->\relax 
                     \ifmmode \else \non@alpherr \mathsf  \fi \use@mathgroup...
l.8 \widetilde{\boldsymbol{\mathsf{x}}}
                                       _n
? 
! Undefined control sequence.
<argument> \@nil 
                 
l.8 \widetilde{\boldsymbol{\mathsf{x}}}
                                       _n
? 
! Use of \reserved@a doesn't match its definition.
\reserved@b ->\relax 
                     \ifmmode \else \non@alpherr \mathsf  \fi \use@mathgroup...
l.8 \widetilde{\boldsymbol{\mathsf{x}}}
                                       _n
? 
! Undefined control sequence.
<argument> \@nil 
                 
l.8 \widetilde{\boldsymbol{\mathsf{x}}}
                                       _n
? 
! Use of \reserved@a doesn't match its definition.
\reserved@b ->\relax 
                     \ifmmode \else \non@alpherr \mathsf  \fi \use@mathgroup...
l.8 \widetilde{\boldsymbol{\mathsf{x}}}
                                       _n
? 
! Undefined control sequence.
<argument> \@nil 
                 
l.8 \widetilde{\boldsymbol{\mathsf{x}}}
                                       _n
? 
! Use of \reserved@a doesn't match its definition.
\reserved@b ->\relax 
                     \ifmmode \else \non@alpherr \mathsf  \fi \use@mathgroup...
l.8 \widetilde{\boldsymbol{\mathsf{x}}}
                                       _n
? 
! Undefined control sequence.
<argument> \@nil 
                 
l.8 \widetilde{\boldsymbol{\mathsf{x}}}
                                       _n
? 
! Use of \reserved@a doesn't match its definition.
\reserved@b ->\relax 
                     \ifmmode \else \non@alpherr \mathsf  \fi \use@mathgroup...
l.8 \widetilde{\boldsymbol{\mathsf{x}}}
                                       _n
? 
! Undefined control sequence.
<argument> \@nil 
                 
l.8 \widetilde{\boldsymbol{\mathsf{x}}}
                                       _n
? 
! Use of \reserved@a doesn't match its definition.
\reserved@b ->\relax 
                     \ifmmode \else \non@alpherr \mathsf  \fi \use@mathgroup...
l.8 \widetilde{\boldsymbol{\mathsf{x}}}
                                       _n
? 
! Undefined control sequence.
<argument> \@nil 
                 
l.8 \widetilde{\boldsymbol{\mathsf{x}}}
                                       _n
? 

! LaTeX Error: Too many math alphabets used in version bold.

See the LaTeX manual or LaTeX Companion for explanation.
Type  H <return>  for immediate help.
 ...                                              
                                                  
l.8 \widetilde{\boldsymbol{\mathsf{x}}}
                                       _n
? x

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