The Four Color Theorem

How many colors do you need to color a map so that no two adjacent regions are colored the same? It turns out that no matter how complicated the map is, you only ever need four! Come try your hand at 4-coloring!

Videos:

• A YouTube video from Numberphile about the Four Color Theorem:
  • https://www.youtube.com/watch?v=NgbK43jB4rQ

Additional Resources:

• A brief survey article by Anders Larson about the history and proof of the Four Color Theorem:
  • https://cklixx.people.wm.edu/teaching/math400/FourColor.pdf
• A Wikipedia article about the Four Color Theorem:
  • https://en.wikipedia.org/wiki/Four_color_theorem

Technical resources:

• An AMS Notices article by Georges Gonthier about the Four Color Theorem:
  • https://www.ams.org/notices/200811/tx081101382p.pdf