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  \textbf{Comments on Maple Problem Set F}
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Be sure to read the instructions for the problems carefully and do all
parts.  
You must use Maple on these problems.  Do not use pplane5 to do them.

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\emph{Problem 1}
\begin{itemize}
\item (iii) is from Section 7.8 of Boyce and diPrima.
\item In part c), make sure to plot enough trajectories.
\item Be sure to indicate the direction of increasing 
  \begin{math}
    t
  \end{math}
  on the trajectories.
\item Be sure to label any real eigenvectors.
\item It is OK to solve the equations again in c) if that is more
convenient than using your solution from a) or b).
\end{itemize}

\emph{Problem 4}
\begin{itemize}
\item In part b) be sure to plot on a large enough time interval.
\begin{itemize}
  \item You should have at least two plots for each system.
  \item You can tell the direction of increasing 
\begin{math}
t
\end{math}
by changing  one end point of the time interval. 
\end{itemize}
\item Indicate the direction of increasing 
\begin{math}
t
\end{math}
on the trajectories.
\end{itemize}


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