Createx

\documentclass{article}
\title{\huge{**title**}}
\author{**author**}
\date{**date**}
\usepackage{amsthm}
\usepackage{amsmath}
\usepackage{geometry}
\geometry{a4paper, margin=1in}
\theoremstyle{plain}
\newtheorem{theorem}{Theorem}[section]
\newtheorem{lemma}{Lemma}[section]
\newtheorem{corollary}{Corollary}[section]
\newtheorem{proposition}{Proposition}[section]
\newtheorem{claim}{Claim}
\theoremstyle{definition}
\newtheorem{definition}{Definition}[section]
\newtheorem{example}{Example}[section]
\newtheorem{problem}{Problem}[section]
\theoremstyle{remark}
\newtheorem*{remark}{Remark}
\newtheorem*{solution}{Solution}
\newtheorem*{acknowledgement}{Acknowledgement}
\begin{document}
\newcommand\dd{\mathrm{d}}
\maketitle


**Contents**

\end{document}