##
Linear Systems Lab

In this lab you will discuss the phase portraits and bifurcations for
the linear system of differential equations

###
**
dx/dt = -0.5 x + A y
**
dy/dt = x - 0.5 y

where A is a parameter and -0.4 < A < 0.4. If you click on the
following icon, you will see a QuickTime animation of the phase
planes for this system as A changes.