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Paul Ehrenfest, Austrian-Dutch physicist and academic (died 1933)
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Paul Ehrenfest
Austrian theoretical physicist (1880–1933)
Paul Ehrenfest was an Austrian theoretical physicist who made major contributions to statistical mechanics and its relation to quantum mechanics, including the theory of phase transition and the Ehrenfest theorem. He befriended Albert Einstein on a visit to Prague in 1912 and…Source: Wikipedia (CC BY-SA)