In most cases, an approximation in the initial conditions lead to an approximation in the final conditions. If I know the speed and direction of a car, I know where it will be in 20 minutes. If I know it’s initial speed and position better, I’ll know it’s position in 20 minutes better.
In chaotic movements, that doesn’t happen. If I know the initial position of a double pendulum, I can’t know how it will look like in 20 seconds, even if I improve my understanding of the initial position.
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