Freeman J. Dyson at the Institute for Advanced Study in Princeton, N.J., in 1972. He gained public renown as a writer and technological visionary.Credit...William E. Sauro/The New York Times Freeman J. Dyson, a mathematical prodigy who left his mark on subatomic physics before turning to messier subjects like Earth’s environmental future and the morality of war, died on Friday at a hospital near P
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