James Grime on the Hadwiger–Nelson problem. Check out Brilliant (get 20% off their premium service): (sponsor) Extra footage from this interview: The Four Color Map Theorem: More on James Grime (you can book him for talks): More James Grime videos: The de Grey paper: A good write up on this topic via Quanta Magazine: The Marijn Heule counterexample: More links & stuff in full description below ↓↓↓ Numberphile is supported by the Mathematical Sciences Research Institute (MSRI): We are also supported by Science Sandbox, a Simons Foundation initiative dedicated to engaging everyone with the process of science.
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