Nan Wan said, "Three is enough, right?"
Shi Xi paused. She really didn't expect Nan Wan to say such a thing.
Bai Cangyang pondered and said, "I think at least five is needed, right? Are four colors enough?"
"It is impossible to construct five or more two-connected areas in a two-dimensional plane, so five colors are enough," Professor Qiao said. "Predecessors used computers to prove the four-color theorem, but there is no simpler written proof. If I can prove this, maybe I can try to compete for the Fields Prize next year."
Nan Wan asked in a daze, "What prize?"
"The Fields Prize is equivalent to the Nobel Prize in Mathematics," Professor Qiao said.
"Then why don't you compete for the Nobel Prize in Mathematics?" Nan Wan thought she was humorous. "Is it because you don't want to?"
Shi Xi scooped up a few balls for herself and the corners of her mouth twitched. "It's because the Nobel Prize in Mathematics didn't exist."
Nan Wan: ??!
