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Zhi-Wei Sun (孙智伟, b. October 16, 1965) is a Chinese mathematician, working primarily on number theory, combinatorics, and group theory. Zhi-Wei Sun and his twin brother Zhi-Hong Sun proved a theorem about what are now known as the Wall-Sun-Sun primes that guided the search for counterexamples to Fermat's last theorem. In 2003, he presented a unified approach to three famous topics of Paul Erdős in combinatorial number theory: covering systems, restricted sumsets, and zero-sum problems. In 2005, using q-series he proved that any natural number can be represented as the sum of a square, an even square, and a triangular number. His Erdős number is 2.
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