%  -*- coding: utf-8 -*-
\documentclass[oneside,11pt]{article}
\usepackage[a4paper,margin=2cm]{geometry}

\newcommand*{\myversion}{2024E}
\newcommand*{\mydate}{Version \myversion\ (\the\year-\mylpad\month-\mylpad\day)}
\newcommand*{\mylpad}[1]{\ifnum#1<10 0\the#1\else\the#1\fi}

\setlength{\parindent}{0pt}
\setlength{\parskip}{4pt plus 1pt minus 1pt}

\usepackage{enumerate}
\usepackage{codehigh}
\usepackage{hyperref}
\hypersetup{
  colorlinks=true,
  urlcolor=blue3,
  linkcolor=green3,
}

%% The \oiint operator is defined with utopia font
\usepackage[utopia]{mathdesign}

\usepackage[mediummath]{nccmath}
\usepackage{medmath}
\booltrue{mdm@bare}

\NewDocumentCommand\mypkg{m}{\textcolor{blue3}{\mbox{#1}}}
\NewDocumentCommand\myopt{m}{\textcolor{yellow3}{\mbox{#1}}}
\NewDocumentCommand\mycmd{m}{\textcolor{green3}{\ttfamily\fakeverb{#1}}}

\begin{document}

\title{\textsf{\color{green3}The \texttt{medmath} package}}
\author{Jianrui Lyu (tolvjr@163.com)}
\date{\mydate}
\maketitle

\section{Introduction}

\subsection{The \texttt{mediummath} option in \texttt{nccmath} package}

There are several problems with \myopt{mediummath} option in \mypkg{nccmath} package.

\begin{enumerate}
  \item The big operators in superscripts and subscripts are too large.
\begin{demohigh}
\[A^{\sum_{0}^{1}x}=B\]
\end{demohigh}
  \item The definite integrals inside \texttt{cases} environment sometimes cause infinite loops.
\begin{codehigh}
\[\begin{cases}
 a & \int_1^t
\end{cases}\]
\end{codehigh}
  \item The \verb!\oiint! operators are not scaled to medium size.
\begin{demohigh}
\[\oiint_{\Sigma}xyzdS=\frac{\sqrt{3}}{120}\]
\end{demohigh}
\end{enumerate}

\subsection{The \texttt{medmath} package}

\makeatletter
\mdm@activate@all
\makeatother

The \mypkg{medmath} package started as a fork of \myopt{mediummath} code in \mypkg{nccmath}
package, aiming to provide more stable and flexible medium-size math commands.

\begin{enumerate}
  \item The big operators in superscripts and subscripts are in medium size.
\begin{demohigh}
\[A^{\sum_{0}^{1}x}=B\]
\end{demohigh}
  \item The definite integrals inside \texttt{cases} environment always work.
\begin{demohigh}
\[\begin{cases}
 a & \int_1^t
\end{cases}\]
\end{demohigh}
  \item The \verb!\oiint! operators are scaled to medium size.
\begin{demohigh}
\[\oiint_{\Sigma}xyzdS=\frac{\sqrt{3}}{120}\]
\end{demohigh}
\end{enumerate}

\section{Usage}

Since \mypkg{medmath} package is a fork of \myopt{mediummath} option in \mypkg{nccmath}
package, the usage is basically the same. Here is a minimal example:

\begin{codehigh}
\documentclass{article}
\usepackage{medmath}
\begin{document}
Inline $\int_0^1x^2dx=\frac13$.
Displayed \[ \int_0^1x^2dx=\frac13. \]
\end{document}
\end{codehigh}
\vspace{0.5em}\hrule
Inline $\int_0^1x^2dx=\frac13$.
Displayed \[ \int_0^1x^2dx=\frac13. \]
\hrule\vspace{0.5em}

You will see that both integral symbols and both fractions are in medium size.
You could see the differences if you remove \mycmd{\usepackage{medmath}} line.

Since version 2024E, \mypkg{medmath} package is able to adjust \mycmd{\medintcorr} for some math fonts,
hence integral operators with subscripts will look better. As a start, only three fonts
(Computer Modern, Mathdesign Utopia, and Mathdesign Charter) are detected.


\end{document}