The Mackey-Glass time-delay diff. equation is
defined by

dx(t)/dt = 0.2x(t-tau)/(1+x(t-tau)^10) - 0.1x(t)

When x(0) = 1.2 and tau = 17, we have a
non-periodic and non-convergent time series that
is very sensitive to initial conditions.
(We assume x(t) = 0 when t < 0.)