Triangular billiards — irrational angles mix (3D)

About this app

A ball rolls forever on a triangular billiard table. With rational angles it is confined to finitely many directions (the direction rose of the equilateral triangle has exactly 6 spokes). If one angle is irrational, it spreads evenly over position and direction, even in pairs (weak mixing). Drag corners, presets, fast forward, occupation map. Result from the preprint catalogue github.com/openai/math (family 150).

Subject: Open problems, solved by AI

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