答案1
感谢@Skillmon,我找到了解决方案。
以下是 MWE:
\documentclass[a4paper,12pt]{report}
\usepackage{amssymb,amsfonts}
\usepackage{amsmath}
\usepackage{graphicx}
\usepackage{mathtools}
\usepackage{amstext}
\usepackage{array}
\usepackage{stmaryrd}
\newcolumntype{L}{>{$}l<{$}}
\newcommand{\spaa}{\mathrm{Spec}(A)}
\newcommand{\Ak}{\textbf{Alg}_k}
\newcommand{\Grp}{\textbf{Grp}}
\DeclareMathOperator{\Hom}{Hom}
\begin{document}
\centering
$\begin{array}{ccccc}
\mathbf{Sch}/k & \xleftarrow{\spaa \mapsfrom A} & \Ak^{\mathrm{op}} & \xrightarrow{A \mapsto \Hom(-, A)} & {\Grp}^{\Ak} \\
\left\{
\begin{tabular}{@{}l@{}}
Affine\\
Schemes
\end{tabular}
\right\}& \leftrightarrow & \Ak^{\mathrm{op}} & \leftrightarrow & \left\{
\begin{tabular}{@{}l@{}}
Representable\\
functors
\end{tabular}
\right\} \\
\left\{
\begin{tabular}{@{}l@{}}
Affine group\\
schemes
\end{tabular}
\right\} & \leftrightarrow & \left\{
\begin{tabular}{@{}L@{}}
\text{Groups in}\\
\Ak^{\mathrm{op}}
\end{tabular}
\right\} & \leftrightarrow&\left\{
\begin{tabular}{@{}l@{}}
Affine\\
groups
\end{tabular}
\right\}
\end{array}$
\end{document}
导致