\documentclass{lecture}

\usepackage{standalone}
\usepackage{tikz}
\usepackage{subcaption}

\title{Groupschemes}
\author{\Large{Christian Dahlhausen}\\[5mm]
Notes typed by\\[1mm]
Christian Merten\\
}
\date{WiSe 2023}

\begin{document}

\newgeometry{right=15mm, left=15mm}
\maketitle
\restoregeometry

\tableofcontents

\input{lec01}
\input{lec02}
\input{lec03}
\input{lec04}
\input{lec05}
\input{lec06}
\input{lec07}
\input{lec08}

\bibliographystyle{alpha}
\bibliography{refs}

\end{document}