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John Wallis died on 8 November 1703 in Oxford, England. He was an English mathematician and theologian who made significant contributions to algebra, infinitesimal calculus, probability, and optics. Wallis is best known for his work on infinite series, including his development of the Wallis product, which is used to approximate π. He also invented the notation ∞ for infinity and the symbol ∫ for integration.