 / dT =    2 * PREY(T) - 0.001 * PREY(T) * PRED(T)
        d PRED / dT = - 10 * PRED(T) + 0.002 * PREY(T) * PRED(T)
      </pre>
      Here, the initial values (5000,100) are a somewhat arbitrary starting point.
    </p>

    <p>
      The pair of ordinary differential equations that result have an interesting
      behavior.  For certain choices of the interaction coefficients (such as
      those given here), the populations of predator and prey will tend to
      a periodic oscillation.  The two populati