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John Stallings partly solved math puzzle

Berkeley teacher tackled Poincare Conjecture

John Stallings Jr., who found a proof for part of the Poincare Conjecture, one of the longest-standing problems in mathematics, died Nov. 24 at his home in Berkeley, Calif. He was 73.

The cause of death was prostate cancer, reported the University of California, Berkeley, where Stallings had....

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