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The Lonely Runner Problem

Ryan Tanaka
Ryan Tanaka
Consumer Tech & Mobile
Updated May 14, 2026 · 2:25 PM UTC 1 min read 4 sources
mathematical track

Photo by Deepak Gautam on Pexels

The ‘lonely runner’ problem: how many runners will inevitably end up running alone, with no other runner alongside them, when moving at constant, unique speeds around a track? This question vexes mathematicians.

Mathematical Complexity

The problem’s setup appears basic, but its complexity lies in the interactions between runners at different speeds.

Current State

The ‘lonely runner’ problem remains unsolved.

Implications

The problem touches on concepts in number theory, algebra, and geometry.

Updates

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  • 2026-04-28 — The UK’s Answer to Darpa Wants to Rewire the Human Brain (source)
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