如何排版以下信件？

Question

我正在学习 LaTeX。我该如何排版这封信件？

Answer 1

或多或少：

\documentclass{article}
\usepackage{mathtools,mathabx}
\usepackage[utf8]{inputenc}
\usepackage[T1]{fontenc}
\usepackage{lmodern}

\begin{document}
\[\begin{split}
\left[\parbox{4cm}{\raggedright \emph{Objects:} smooth curves defined over $K$\\ \emph{Maps:} nonconstant \dots}\right]
& \rightsquigarrow 
\left[\parbox{4cm}{\raggedright \emph{Objects:} smooth curves defined over $K$\\ \emph{Maps:} nonconstant \dots}\right]\\
C/K & \rightsquigarrow K(C)\\
\phi: C_1\rightarrow C_2 & \rightsquigarrow \phi^\star: K(C_2)\rightarrow K(C_1)
\end{split}\]
\end{document}