\documentclass{lecture}

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

\title{Groupschemes}
\author{Christian Dahlhausen\\[5mm]
Transcript of\\[1mm]
Christian Merten (\href{mailto:cmerten@mathi.uni-heidelberg.de}{cmerten@mathi.uni-heidelberg.de})\\
}
\date{WiSe 2023}

\begin{document}

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

\tableofcontents

\input{lec01}

\end{document}