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Donald Dines Wall
Donald Dines Wall (August 13, 1921 – November 28, 2000) was a mathematician working primarily on number theory. He obtained his Ph.D. on normal numbers from University of California, Berkeley in 1949, where his adviser was Derrick Henry Lehmer. His better known papers include the first modern analysis of Fibonacci sequence modulo a positive integer.
Drawing on Wall's work, Zhi-Hong Sun and his twin brother Zhi-Wei 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.
==Early life==
Wall was born in Kansas City, Missouri on August 13, 1921 to Donald F. Wall and Mary Wooldridge. The family lived in Louisiana and Texas as he was growing up. In 1933, they moved to Whittier, California, then in 1936 to Santa Barbara, California where he graduated from High School in 1938. He enrolled at UCLA and joined the Delta Sigma Phi fraternity.
In April 1940 he had a successful operation to remove a brain tumor at UC Hospital in San Francisco. The surgeon was Howard C. Naffziger, who later served on the board of Regents of the University of California. He and Naffziger kept in touch for many years afterwards.
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