And no math in section-headings

chapters/derivationofstream.tex

@@ -150,11 +150,11 @@ \section{Rationale for the formulation of inStream}\doublelabel{rationale-for-th
 \end{equation*}
 
 \section{Special cases covered by inStream definition}\doublelabel{special-cases-covered-by-the-instream-operator-definition}
-\subsection{Stream connector is not connected ($N = 1$)}\doublelabel{stream-connector-is-not-connected-n-1}
+\subsection{Stream connector is not connected (N = 1)}\doublelabel{stream-connector-is-not-connected-n-1}
 For this case, the return value of \lstinline!inStream! is arbitrary.
 Therefore, it is set to the outflow value.
 
-\subsection{Connection of 2 stream connectors, one to one connections ($N = 2$)}\doublelabel{connection-of-2-stream-connectors-one-to-one-connections-n-2}
+\subsection{Connection of 2 stream connectors, one to one connections (N = 2)}\doublelabel{connection-of-2-stream-connectors-one-to-one-connections-n-2}
 
 \begin{align*}
 \text{\lstinline!inStream!}(h_{outflow,1}) &= \frac{\text{max}(-\dot{m}_2,0)h_{outflow,2}}{\text{max}(-\dot{m}_2,0)}=h_{outflow,2}\\