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John Wiles passed away on April 5, 1999. He was a prominent figure in the field of mathematics, known for his groundbreaking work in number theory. Wiles' most significant achievement was the proof of Fermat's Last Theorem, a centuries-old mathematical problem that had eluded mathematicians for generations. His proof, published in 1994, revolutionized the field of number theory and earned him widespread recognition and accolades.