is positive, the system is said to be chaotic and small uncertainties
in the initial condition can on average increase. For systems
whose equations of motion are known, Lyapunov exponents can
be estimated quite directly, while their estimation from a finite
set of experimental data is a little more complicated. Here, the
method proposed by Wolf et al. (1985) was adopted that allows
the estimation of the largest positive Lyapunov exponent γ if
it exists. Starting from the reconstruction of orbits in the phase
space, the method is based on monitoring the long-term evolution
of the distance between a single pair of orbits.