The proof resolves a nearly 80-year-old problem known as the Duffin-Schaeffer conjecture. In doing so, it provides a final answer to a question that has preoccupied mathematicians since ancient times: ...

Later mathematicians discovered an even better and nearly as concise approximation for pi: 355/113. “It’s hard to write down what pi is,” said Ben Green of Oxford. “What people have tried to do is to ...