Person: Hayes (3), David
David Hayes was an American mathematician who worked in number theory.
Mathematical Profile (Excerpt):
 After graduating with his Ph.D., Hayes was appointed as an assistant at the University of Tennessee in the autumn of 1963.
 In addition to his permanent position at Massachusetts, Hayes spent the academic year 197475 at the University of Oxford in England.
 In the summer of 1991, David, along with David Goss and myself, organized a large conference (over 100 participants from all over the world) at Ohio State University on the subject of "The Arithmetic of Function Fields".
 Let us look at some of Hayes' publications.
 Hayes was able to show that, with certain extra conditions, this result generalised to show that if the finite field is sufficiently large there are no permutation polynomials of even degree.
 In the second of the three papers he published in 196667, Hayes proved a polynomial version of Vinogradov's theorem that every sufficiently large odd integer is the sum of three primes.
 Hayes was an invited speaker at many conferences.
 We mentioned above that Hayes spent time at Harvard University in the autumn of 1999 and while he was there he delivered a series of lectures on the Stark conjectures.
 David and Irene Hayes enjoyed travelling together but sadly they only had six years together before Hayes died on Sunday, 10 April 2011, at the Quabbin Valley Healthcare in Athol.
 Let us end this biography by quoting the personal comments by Michael Rosen who writes of Hayes' "richness of his interests and the significance of his contributions".
 David would visit us there to hike in the autumn and ski in the winter.
 Many people who knew David describe him as very intelligent, quiet, modest, and gentle.
Born 14 July 1937, Raleigh, North Carolina, USA. Died 10 April 2011, Athol, Massachusetts, USA.
View full biography at MacTutor
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References
Adapted from other CC BYSA 4.0 Sources:
 Oâ€™Connor, John J; Robertson, Edmund F: MacTutor History of Mathematics Archive