如何添加AMS代码，关键词

Question

有人可以建议我如何为以下代码添加 AMS 代码和关键词吗？

\documentclass[12pt,reqno,a4paper]{amsart}
\usepackage{extsizes}
\usepackage{blindtext}
\textheight 9.3in \textwidth 6.5in
\calclayout
\usepackage{mathtools}
\usepackage{amsmath,amsthm,amsfonts,amssymb}
\usepackage{mathrsfs}
\usepackage[all]{xy}
\newcommand{\mc}{\mathcal}
\newcommand{\mf}{\mathfrak}
\usepackage[normalem]{ulem}
\theoremstyle{definition}
\newtheorem{theorem}{Theorem}[section]
\theoremstyle{definition}
\newtheorem{construction}{Construction}[section]
\theoremstyle{definition}
\newtheorem{corollary}{Corollary}[section]
\theoremstyle{definition}
\newtheorem{lemma}{Lemma}[section]
\theoremstyle{definition}
\newtheorem{definition}{Definition}[section]
\theoremstyle{definition}
\newtheorem{remark}{Remark}[section]
\theoremstyle{definition}
\newtheorem{proposition}{Proposition}[section]
\theoremstyle{definition}
\newtheorem{example}{Example}[section]
\theoremstyle{definition}
\newtheorem*{question}{Question}
\theoremstyle{definition}
\newtheorem*{solution}{Solution}
\theoremstyle{definition}
\newtheorem{exercise}{Exercise} 
\usepackage{tikz-cd}
\usepackage[utf8]{inputenc}
\usepackage[english]{babel}
\usepackage{datetime}
\usepackage{hyperref}
% \renewcommand{\baselinestretch}{2} 
\usepackage{color}
\pagestyle{myheadings}
\newcommand{\xra}{\xrightarrow}
\newcommand{\ra}{\rightarrow}
\title{Something}
\author{Someone} 

\begin{document}
    \today
\begin{abstract}

\end{abstract} 

\maketitle 
%\tableofcontents 

\end{document}

Answer 1

您只需在 之前使用\keywords{...}and即可。\subjclass{...}\maketitle

我重新组织了你的序言，使其更加一致。你应该更加注意包和声明的顺序；就目前的情况而言，序言令人困惑且难以维护。

一项\theoremstyle声明一直有效，直到被另一项声明撤销，因此您无需一遍又一遍地重复它。

\documentclass[12pt,reqno,a4paper]{amsart}
%\usepackage[utf8]{inputenc} % not needed with up-to-date TeX systems
\usepackage[english]{babel}

\usepackage{amsmath,amsthm,amsfonts,amssymb}
\usepackage{mathtools}
\usepackage{color}

\usepackage{mathrsfs}
\usepackage[all]{xy}
\usepackage{tikz-cd}
\usepackage[normalem]{ulem} % do you *really* need it?
\usepackage{datetime}

\usepackage{hyperref}

\theoremstyle{definition}

\newtheorem{theorem}{Theorem}[section]
\newtheorem{construction}{Construction}[section]
\newtheorem{corollary}{Corollary}[section]
\newtheorem{lemma}{Lemma}[section]
\newtheorem{definition}{Definition}[section]
\newtheorem{remark}{Remark}[section]
\newtheorem{proposition}{Proposition}[section]
\newtheorem{example}{Example}[section]
\newtheorem*{question}{Question}
\newtheorem*{solution}{Solution}
\newtheorem{exercise}{Exercise} 

\newcommand{\mc}{\mathcal}
\newcommand{\mf}{\mathfrak}
\newcommand{\xra}{\xrightarrow}
\newcommand{\ra}{\rightarrow}

\pagestyle{myheadings}

\setlength{\textheight}{9.3in}
\setlength{\textwidth}{6.5in}
\calclayout

% metadata

\title{Something}
\author{Someone}
\date{\today}

\begin{document}

\begin{abstract}
Some text for the abstract
\end{abstract}

\keywords{Keyword 1, keyword 2}

\subjclass{12X20, 13Y21}

\maketitle 

\end{document}

为了制作图片，我降低了文本的高度。