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svmono 和引号出现奇怪错误

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svmono 和引号出现奇怪错误

当我尝试使用时svmono，它遇到了以下一些错误：

Error   Missing number, treated as zero.

为此提供的帮助：

This is usually caused by a LaTeX command expecting but not finding
either a number or a length as an argument. You may have omitted an
argument, or a square bracket in the text may have been mistaken for
the beginning of an optional argument. This error is also caused by
putting \protect in front of either a length command or a command such
as \value that produces a number.

和

Error   Illegal unit of measure (pt inserted).

对此的帮助：

If you just got a

      ! Missing number, treated as zero.

error, then this is part of the same problem.  If not, it means that
LaTeX was expecting a length as an argument and found a number
instead.  The most common cause of this error is writing 0 instead of
something like 0in for a length of zero, in which case typing return
should result in correct output. However, the error can also be caused
by omitting a command argument.

错误的位置位于主体的某些环境的开头quotation。

这是一个抛出这些错误的最小工作示例：

\documentclass{svmono}

\begin{document}

\begin{quotation}
  Plus grande est
\end{quotation}

\end{document}

错误出现在“g”和“r”之间：

--- TeX said ---
<to be read again> 
                   g
l.6   Plus g
            rande est

基本上，所有以“plus”或“Plus”开头的引号环境都会引发此错误。

我可以通过改写“{plus}”或“{Plus}”来解决错误，但我为什么要这样做呢？

答案1

问题在于svmono实现quotation环境的方式。

定义是

\renewenvironment{quotation}
               {\par\addvspace{6pt}
                \list{}{\listparindent12\p@%
                        \leftmargin=12\p@%
                        \itemindent    \listparindent
                        \rightmargin   \leftmargin
                        \parsep        \z@ \@plus\p@%
                        \small}%
                \item\relax\hskip-\listparindent}
               {\endlist}

当引用以“加”或“减”开头时，这些词将被解释为用于增加或减少长度的基本 TeX 命令。因此，必须终止计算或将计算包含在组中。

因此替换行

\item\relax\hskip-\listparindent

和

\item\relax\hskip-\listparindent\relax

防止将“加”和“减”这两个词理解为运算符。

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