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scienceJan 30, 20264:50pending

Theorem on Friends and Strangers

About this episode

Today, we explore the Theorem on friends and strangers theory—the idea that order inevitably appears in large systems. Starting with R(3,3) = 6 and R(4,4) = 18, we tour why R(5,5) remains unknown between 43 and 46, how SAT solvers prune impossibilities, and how Graham’s number frames the scale of these questions. Along the way we unpack why complete disorder can’t exist in big structures and what that says about math and the world.


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Theorem on Friends and Strangers

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