\section{sub1}
\label{sec:sub1}

\begin{equation}
  f(x) = 42
  \label{eq:sub1-is-working}
\end{equation}

\begin{theorem}
  \label{th:first}
  test
\end{theorem}

\begin{theorem}
  \label{th:second}
  test
\end{theorem}

\begin{proposition}
  \label{prop:first}
  test
\end{proposition}

\begin{proposition}
  \label{prop:second}
  test
\end{proposition}

\begin{equation}
  \label{eq:test1}
  f(x) = 1
\end{equation}

\begin{equation}
  \label{eq:test2}
  f(x) = 2
\end{equation}

\begin{equation}
  \label{eq:test3}
  f(x) = 3
\end{equation}

\begin{equation}
  \label{eq:test4}
  f(x) = 4
\end{equation}

\begin{equation}
  \label{eq:test5}
  f(x) = 5
\end{equation}

\begin{equation}
  \label{eq:test6}
  f(x) = 6
\end{equation}

\begin{equation}
  \label{eq:test7}
  f(x) = 7
\end{equation}

\begin{equation}
  \label{eq:test8}
  f(x) = 8
\end{equation}

\begin{equation}
  \label{eq:test9}
  f(x) = 9
\end{equation}

\begin{equation}
  \label{eq:test10}
  f(x) = 10
\end{equation}
