Predictability (also called banality) refers to the degree that a correct
predictionor forecastof a system's state can be made either qualitatively or quantitatively. While the second law of thermodynamicscan tell us about the equilibrium statethat a system will evolve to, and steady states in dissipative systems can sometimes be predicted, there exists no general rule to predict the time evolutionof systems far from equilibrium, e.g. chaotic systems, if they do not approach some kind of equilibrium. Their predictability usually deteriorates with time. To quantify predictability, the rate of divergence of system trajectories in phase spacecan be measured ( Kolmogorov-Sinai entropy, Lyapunov exponents).
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