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\usepackage{lastpage} %% Used for "Page X of Y" in the header.
                      %% For this to work, you have to call pdflatex twice.
\usepackage{enumerate} %% Used to change the style of enumerations (see below).

\usepackage{amssymb} %% Definitions for math symbols.
\usepackage{amsmath} %% Definitions for math symbols.

\usepackage{tikz}  %% Pagacke to create graphics (graphs, automata, etc.)
\usetikzlibrary{automata} %% Tikz library to draw automata
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%% Left side of header
\lhead{\course\\\semester\\Exercise \homeworkNumber}
%% Right side of header
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\newcommand{\authorname}{A. Student\\Another Student}
\newcommand{\semester}{Fall Semester 2020}
\newcommand{\course}{Discrete Mathematics in Computer Science}
\newcommand{\homeworkNumber}{1}


\begin{document}

\section*{Aufgabe 1.1}

\begin{enumerate}[(a)]
    \item 
    \item
\end{enumerate}


\end{document}