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Richard Hamilton, Who Helped Solve a Mathematical Mystery, Dies at 81

He came up with an innovative equation called the Ricci flow that helped mathematicians explore fundamental questions that were once out of reach.

Β© May Tse/South China Morning Post, via Getty Images

Richard Hamilton in 2011. He is often credited, along with the mathematician Grigori Perelman, with developing a solution to a problem known as the PoincarΓ© conjecture.
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