Billard de Sinaï

Rarity: Common

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What Wikipedia says

Le billard de Sinaï - du nom du mathématicien russe Iakov Sinaï - est un billard à deux degrés de liberté très simple à décrire, et qui présente des propriétés chaotiques intéressantes.

Excerpt from the Wikipedia article “Billard de Sinaï”, under the CC BY-SA 4.0 license. Read the article on Wikipedia

Image: Auteur inconnu, CC BY 2.5, via Wikimedia Commons.