Avoid use of \texttt in connectors.tex

chapters/connectors.tex

@@ -435,13 +435,13 @@ \section{Generation of Connection Equations}\doublelabel{generation-of-connectio
 (zero-sum) variables of the form
 \begin{itemize}
 \item
-\lstinline!a1 = a2 = ... = an;                // neither flow nor stream variables!
+$a_{1} = a_{2} = \ldots = a_{n}$ (neither flow nor stream variables)
 \item
-\lstinline!z1 + z2 + (-z3) + ... + zn =! \small{\textbf{0}} \lstinline!; // flow-variables!
+$z_{1} + z_{2} + (-z_{3}) + \ldots + z_{n} = \mathbf{0}$ (flow-variables)
 \end{itemize}
 
-The bold-face \textbf{0} represents an array or scalar zero of
-appropriate dimensions (i.e. the same size as z).
+The bold-face $\mathbf{0}$ represents an array or scalar zero of
+appropriate dimensions (i.e. the same size as $z$).
 
 For an \lstinline!operator record! type this uses the operator \lstinline!'0'! -- which must be
 defined in the operator record; and all of the flow-variables for the
@@ -452,8 +452,8 @@ \section{Generation of Connection Equations}\doublelabel{generation-of-connectio
 
 In order to generate equations for flow variables (using the
 \lstinline!flow! prefix), the sign used for the connector variable
-\texttt{z\textsubscript{i}} above is +1 for inside connectors and -1 for outside
-connectors (\texttt{z\textsubscript{3}} in the example above).
+$z_{i}$ above is +1 for inside connectors and -1 for outside
+connectors ($z_{3}$ in the example above).
 
 \begin{example}
 Simple example: