Add title on an article [closed]

Question

I need help with a basic thing, the title doesn't appear in my paper

\documentclass[a4paper,10pt]{article}%{scrartcl}{extarticle}
%\usepackage{refcheck}


\usepackage{amsmath}
\usepackage{amsthm}
%\usepackage{amsfonts}
\usepackage{amssymb}
%\usepackage[latin1]{inputenc}
%\usepackage[dvips]{graphicx}
\usepackage{enumitem}
%\usepackage[all]{xy}
%\usepackage{mathtools}
%\mathtoolsset{showonlyrefs=true}

\DeclareMathOperator{\Ker}{Ker}
\DeclareMathOperator{\Ima}{Im}
\DeclareMathOperator{\Ric}{Ric}

\font\ddpp=msbm10 %scaled \magstep 1
\def\R{\hbox{\ddpp R}}
\def\C{\hbox{\ddpp C}}
\def\L{\hbox{\ddpp L}}
\def\S{\hbox{\ddpp S}}
\def\Z{\hbox{\ddpp Z}}
\def\H{\hbox{\ddpp H}}


\begin{document}

\theoremstyle{plain}% default
\newtheorem{thm}{Theorem}[section]
\newtheorem{lemma}[thm]{Lemma}
\newtheorem{prop}[thm]{Proposition}
\newtheorem{cor}[thm]{Corollary}
\newtheorem{RK}[thm]{Rellich-Kondrachov's Lemma}


\theoremstyle{definition}
\newtheorem{definition}[thm]{Definition}
\newtheorem{ex}[thm]{Examples}
\newtheorem{conj}{Conjecture}[section]
%\newtheorem{ex}{Ejemplos}[section]


\theoremstyle{remark}
\newtheorem{remark}[thm]{Remark}
\newtheorem*{note}{Note}
\newtheorem*{obs}{Observation}






\newcommand{\be}{\begin{equation}}
\newcommand{\ee}{\end{equation}}
\newcommand{\noi}{\noindent}
\newcommand{\ben}{\begin{enumerate}}
\newcommand{\een}{\end{enumerate}}
\newcommand{\bit}{\begin{itemize}}
\newcommand{\eit}{\end{itemize}}
\newcommand{\bp}{\begin{proof}}
\newcommand{\ep}{\end{proof}}
\newcommand{\bprop}{\begin{prop}}
\newcommand{\eprop}{\end{prop}}
\newcommand{\bdf}{\begin{definition}}
\newcommand{\edf}{\end{definition}}


\title{The Hodge Theorem}
\date{October 31, 475}
\author{Raul}