The conversation between human and AI assistant.
What are some solved problems in mathematics?
Wow! That must have taken a lot of work to solve. Do you know of any others?
Yes, there are several other famous examples, such as the Four Color Theorem, which deals with how many colors are necessary to color a map without any two neighboring regions having the same color, and the Kepler conjecture, which deals with the densest possible sphere packing. Both were solved in the late 20th century.