\section{Kapitel}
\lipsum[1]
\begin{figure}[h]
    \begin{center}
            \includegraphics[width=0.25\textwidth]{graphic/image.png}
            \caption{Sample image}
            \label{Bild: 2.1}
    \end{center}
\end{figure}
%\subsection{Sub chapters 1.1}
\subsection{Unterkapitel}
\lipsum[2]
\begin{equation}
        \int_a^bu\frac{d^2v}{dx^2}\,dx
        =\left.u\frac{dv}{dx}\right|_a^b
        -\int_a^b\frac{du}{dx}\frac{dv}{dx}\,dx. 
\end{equation}
%\subsection{Sub chapters 1.2}
\subsection{Unterkapitel}
\begin{equation}
    e^x = 1 + x + \frac{x^2}{2} + \frac{x^3}{6} + \cdots = \sum_{n\geq 0} \frac{x^n}{n!}
\end{equation}
\lipsum[3]
\cite{Goodfellow2016}