mtpro2 中二项式系数的括号过大

Question 1

我同意，括号确实看起来太大了。幸运的是，可以使用与第三个 binom 相同的代码来调整定义：

\documentclass{article}
\usepackage{amsmath}
\usepackage[lite]{mtpro2}


\newcommand{\mybinom}[2]{\biggl(\genfrac{}{}{0pt}{}{#1}{#2}\biggr)}
\everydisplay{\let\binom\mybinom}



\begin{document}
Binomial coefficient has overly large parentheses in \verb|mtpro2|
``lite'':
\[
\begin{gathered}
\binom{n}{k} = \frac{n!}{k! \, (n-k)!}
             = \left(\genfrac{}{}{0pt}{}{n}{k}\right)
             = \biggl(\genfrac{}{}{0pt}{}{n}{k}\biggr), \\
\binom{k+\ell}{j}
             = \left(\genfrac{}{}{0pt}{}{k+\ell}{j}\right)
             = \biggl(\genfrac{}{}{0pt}{}{k+\ell}{j}\biggr).
\end{gathered}
\]
A \verb|\left...\right| pair is not ideal since the delimiters may
change their sizes, depending on whether the content has ascenders
and/or descenders. A \verb|\biggl...\biggr| pair seems just right.

$\binom{n}{k}$
\end{document}

Answer

我同意，括号确实看起来太大了。幸运的是，可以使用与第三个 binom 相同的代码来调整定义：

\documentclass{article}
\usepackage{amsmath}
\usepackage[lite]{mtpro2}


\newcommand{\mybinom}[2]{\biggl(\genfrac{}{}{0pt}{}{#1}{#2}\biggr)}
\everydisplay{\let\binom\mybinom}



\begin{document}
Binomial coefficient has overly large parentheses in \verb|mtpro2|
``lite'':
\[
\begin{gathered}
\binom{n}{k} = \frac{n!}{k! \, (n-k)!}
             = \left(\genfrac{}{}{0pt}{}{n}{k}\right)
             = \biggl(\genfrac{}{}{0pt}{}{n}{k}\biggr), \\
\binom{k+\ell}{j}
             = \left(\genfrac{}{}{0pt}{}{k+\ell}{j}\right)
             = \biggl(\genfrac{}{}{0pt}{}{k+\ell}{j}\biggr).
\end{gathered}
\]
A \verb|\left...\right| pair is not ideal since the delimiters may
change their sizes, depending on whether the content has ascenders
and/or descenders. A \verb|\biggl...\biggr| pair seems just right.

$\binom{n}{k}$
\end{document}

Question 2

我们可以\fontdimen20在数学符号字体中进行修改。

\documentclass{article}
\usepackage{amsmath}
\usepackage[lite]{mtpro2}

% Alter \fontdimen20 in the math symbol font
\DeclareFontShape{LMP2}{mtt}{m}{n}{%
  <-7> mt2syf
  <7-9> mt2sys
  <9-> mt2syt
}{% Default is 2.39. We change it to 2.38
  \fontdimen20\font=2.38\fontdimen6\font
}

\begin{document}
Binomial coefficient has overly large parentheses in \verb|mtpro2|
``lite'':
\[
\begin{gathered}
\binom{n}{k} = \frac{n!}{k! \, (n-k)!}
             = \left(\genfrac{}{}{0pt}{}{n}{k}\right)
             = \biggl(\genfrac{}{}{0pt}{}{n}{k}\biggr), \\
\binom{k+\ell}{j}
             = \left(\genfrac{}{}{0pt}{}{k+\ell}{j}\right)
             = \biggl(\genfrac{}{}{0pt}{}{k+\ell}{j}\biggr).
\end{gathered}
\]
A \verb|\left...\right| pair is not ideal since the delimiters may
change their sizes, depending on whether the content has ascenders
and/or descenders. A \verb|\biggl...\biggr| pair seems just right.
\end{document}

请注意构造的更好间距\biggl( \genfrac{}{}{0pt}{}{...}{...} \biggr)。

解释

如果 TeX 允许一个 TFM 文件中存在超过 16 种不同的高度/深度，那么一切都应该可以正常工作。

当 TeX 使用分隔符构造“广义分式”时，它遵循附录 G 中的规则 15e。TeXbook：

[规则] 15e。将规则 15c 或 15d 中构造的垂直盒子用分隔符包围起来，分隔符的高度加深度至少为

Answer