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Viewers like you help make PBS (Thank you 😃) . Support your local PBS Member Station here: https://to.pbs.org/donateinfi At one time, Wolverine served on four different superhero teams. How did he do it? He may have used graph coloring. Tweet at us! @pbsinfinite Facebook: facebook.com/pbsinfinite series Email us! pbsinfiniteseries [at] gmail [dot] com Graph coloring may seem simple but the mathematics behind it is surprising difficult and it pops up in a number strange places. Kelsey discusses Sudoku, the Four Color Theorem, the Hadwiger Nelson Problem and how graph coloring can be used to schedule the most effective way to save the planet. Find out how math can defeat the combined might of Thanos, Magneto, Kang, Dormammu, Ultron, Apocalypse and Dr. Doom. Correction: At 3:58, "Four is the maximum number of required colors" Previous Episode - What is a Random Walk? https://www.youtube.com/watch?v=stgYW6M5o4k Links to other resources: Sudoku: http://www.ams.org/notices/200706/tx070600708p.pdf General Applications: http://web.math.princeton.edu/math_alive/5/Notes2.pdf Page on graph colorings: https://webdocs.cs.ualberta.ca/~joe/Coloring/index.html Book on general graph theory: http://diestel-graph-theory.com/ The Four Color Theorem - Numberphile: https://www.youtube.com/watch?v=NgbK43jB4rQ Written and Hosted by Kelsey Houston-Edwards Produced by Rusty Ward Graphics by Ray Lux Made by Kornhaber Brown (www.kornhaberbrown.com) Comments answered by Kelsey: Ofir David https://www.youtube.com/watch?v=stgYW6M5o4k&lc=z12vin2o2vn0dxvn522wsr5j0wexezd0j Bertie Blue https://www.youtube.com/watch?v=stgYW6M5o4k&lc=z22xhfxbgx3qsh2ujacdp4333fssxeq5w1z4avpprddw03c010c TehAvenger29 https://www.youtube.com/watch?v=stgYW6M5o4k&lc=z12qtxqgqpyftrzmy22wyxl5gy3ssvcpf04