The math world is losing its mind over the new solution to an Erdős problem. This is what AI found, how we missed it—and why it matters.

This is the question (warning, trying to solve it is both difficult and addictive): Albert and Bernard just met Cheryl. “When’s your birthday?” Albert asked Cheryl. Cheryl thought a second and said, ...

While this three-step process is the ideal process of applied math, reality is more complicated. Once I reach the second step where I want the solution of the math problem, very often, if not most of ...