How Many Numbers Exist? Infinity Proof Moves Math Closer to an Answer.

In October 2018, David Asperó was on holiday in Italy, gazing out a car window as his girlfriend drove them to their bed-and-breakfast, when it came to him: the missing step of what’s now a landmark new proof about the sizes of infinity. “It was this flash experience,” he said. Asperó, a mathematician at the University of East Anglia in the United Kingdom, contacted the collaborator with whom he’d…

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