# Where are Title, Author and Date?

I've the following Example Code:

\documentclass{article}

\usepackage[utf8]{inputenc}
\usepackage[german]{babel}
\usepackage{blindtext}
\usepackage{lmodern}
\usepackage[T1]{fontenc}
\usepackage[utf8]{inputenc}
\usepackage{amssymb}
\usepackage{amsmath}
\usepackage{amsthm}
\usepackage{dsfont}
\usepackage{mathrsfs}
\usepackage{marvosym}
\usepackage{tabularx}
\usepackage{tabulary}
\usepackage{booktabs}
\usepackage{wasysym}
%\usepackage[a4paper,top=1cm,bottom=2cm,left=2cm,right=2cm]{geometry}

\theoremstyle{remark}
\newtheorem*{remark}{Remark}

\theoremstyle{definition}
\newtheorem{definition}{Definition}[section]

%\newtheorem{theorem}{Theorem}
\newtheorem{theorem}{Theorem}[section]
\newtheorem{corollary}{Corollary}[theorem]
\newtheorem{lemma}[theorem]{Lemma}

\title{Theorems And Proofs}
\author{Napoleone Bonaparte}
\date{May 2014}

\renewcommand\qedsymbol{$\blacksquare$}

\begin{document}
\begin{flushleft}

\section{Introduction}
Theorems can easily be defined

\theoremstyle{definition}
\begin{definition}{Fibration}
A fibration is a mapping between two topological spaces that has the homotopy lifting property for every space $X$.
\end{definition}

\begin{theorem}
Let $f$ be a function whose derivative exists in every point, then $f$ is
a continuous function.
\end{theorem}

\begin{theorem}[Pythagorean theorem]
\label{pythagorean}
This is a theorema about right triangles and can be summarised in the next
equation
$x^2 + y^2 = z^2$
\end{theorem}

And a consequence of theorem \ref{pythagorean} is the statement in the next
corollary.

\begin{corollary}
There's no right rectangle whose sides measure 3cm, 4cm, and 6cm.
\end{corollary}

You can reference theorems such as \ref{pythagorean} when a label is assigned.

\begin{lemma}
Given two line segments whose lengths are $a$ and $b$ respectively there is a
real number $r$ such that $b=ra$.
\end{lemma}
\begin{proof}
To prove it by contradiction try and assume that the statemenet is false,
proceed from there and at some point you will arrive to a contradiction.
\end{proof}

\end{flushleft}
\end{document}

but I don't understand because I dont see Title, Author and Date..

• Try \maketitle after \begin{document}.
– yo'
Commented Feb 13, 2016 at 20:38
• \author and friends just store the data in internal variables until you ask latex to typeset them, for example as yo' sats, by using \maketitle Commented Feb 13, 2016 at 20:43
• @mle You're welcome. I just can't help myself, but this is some very basic knowledge. Have you read any LaTeX tutorial book or alike?
– yo'
Commented Feb 13, 2016 at 21:27
• of course, but I forgot this particular, it can happen! :)
– mle
Commented Feb 13, 2016 at 22:32