\documentclass[a4paper,10pt]{article}
\usepackage[utf8]{inputenc}
\usepackage{fullpage}
\usepackage{amsmath}
\usepackage{amsfonts}
\usepackage{todonotes}

\title{Titel in pdf}
\begin{document}
\setlength{\parindent}{0in}
% Inhalt
\end{document}

\documentclass{beamer}
%\usetheme{Warsaw}
\usepackage[utf8]{inputenc}

\begin{document}

\title[DTI] % (optional, only for long titles)
{Langer Titel}
\subtitle{Untertitel}
\author[Name] % (optional, for multiple authors)
{Mein Name}
\date{July 2nd, 2014}
\subject{Computer Science}
\frame{\titlepage}

\begin{frame}
  \frametitle{Titel}
  % Inhalt
\end{frame}
\end{document}

\begin{itemize}
   \item Punkt 1
   \item Punkt 2
\end{itemize}

\begin{columns}[T] % contents are top vertically aligned
\begin{column}[T]{5cm}
  % links
\end{column}
\begin{column}[T]{5cm}
  % rechts
\end{column}
\end{columns}

\begin{tiny} kleiner Text \end{tiny}

\includegraphics[height=2cm]{diffusion-iso.jpg}

\usepackage{amsfonts}

\mathbb{R} % doppelt gestrichene Buchstaben

\usepackage{dsfont}

\mathds{R} % doppelt gestrichene Buchstaben

\documentstyle[a4, 12pt, paket1, paket2]{article}

\documentclass[a4paper, 12pt]{article}
\usepackage{paket1, paket2}