Read news on simpler solution with our app.
Read more in the app
The Four-Color Theorem Has Haunted Mathematicians for Decades. It Just Got a Rare New Proof, but Some Still Long for a Simpler Solution
/https://tf-cmsv2-smithsonianmag-media.s3.amazonaws.com/filer_public/d8/6b/d86b33bf-ba91-4be7-ac86-157eab2eeda2/4c-theorem-crvico-santos-lede.jpg)