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Efforts to Ground Physics in Math Are Opening the Secrets of Time
By proving how individual molecules create the complex motion of fluids, three mathematicians have illuminated why time can’t flow in reverse.
At the turn of the 20th century, the renowned mathematician David Hilbert had a grand ambition to bring a more rigorous, mathematical way of thinking into the world of physics. Boltzmann could already show that Newton’s laws of motion give rise to his mesoscopic equation, so long as one crucial assumption holds true: that the particles in the gas move more or less independently of each other. About a year before the mathematicians posted their paper online, Deng was at a conference, where he met with a graduate student at Princeton University named Xiao Ma.
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