Poincaré recurrence theorem

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What Wikipedia says

In mathematics and physics, the Poincaré Recurrence Theorem states that if a system has a finite volume (or total probability measure) and preserves that volume over time, then almost every initial state will eventually return arbitrarily close to its starting position, and it will do so infinitely many times.

Excerpt from the Wikipedia article “Poincaré recurrence theorem”, under the CC BY-SA 4.0 license. Read the article on Wikipedia