% !TeX root = ../script.tex
\documentclass[../../script.tex]{subfiles}

\begin{document}
    \chapter{Operator Theory}
    \vspace*{\fill}\par
    \pagebreak  

    \subfile{sections/linear_ops.tex}
    \subfile{sections/dual_spaces.tex}
    \subfile{sections/hilbert_spaces.tex}
\end{document}