Riho Terras (mathematician)

Riho Terras (June 13, 1939 – November 28, 2005)[1] was an Estonian-American mathematician.[2] He was born in Tartu, Estonia and moved to Ulm, Germany before starting school.[3] In 1951 he emigrated to the United States along with his mother.[2][3] In 1965, he was given the Milton Abramowitz award for his studies at the University of Maryland.[4] He finished his PhD in 1970 at the University of Illinois Urbana-Champaign.[5]

Riho Terras
Born13 June 1939
Tartu
Died28 November 2005 (aged 66)
San Diego
Alma mater
OccupationMathematician
Employer
Awards
  • Abramowitz Award (1965)

He is known for the Terras theorem about the Collatz conjecture, published in 1976,[6] which proved that the conjecture holds for "almost all" numbers and established bounds for the conjecture.[7][8]

He married fellow mathematician Audrey Terras.[9]

References
  1. "Obituary - Vaba Eesti Sõna" (in Estonian). 2005-12-13. p. 11. Retrieved 2021-08-01 – via DIGAR Estonian Articles.
  2. "Riho Terras matemaatika doktoriks - Vaba Eesti Sõna" (in Estonian). 1970-10-22. p. 6. Retrieved 2021-08-01 – via DIGAR Estonian Articles.
  3. "Ramsey School News". The News. Patterson, NJ. May 12, 1951. p. 6. Retrieved April 12, 2023 – via Newspapers.com. open access
  4. "Award Winners - Department of Mathematics". University of Maryland. Retrieved 2021-08-01.
  5. "Riho Terras - The Mathematics Genealogy Project". mathgenealogy.org. Retrieved 2021-08-01.
  6. Terras, Riho (1976). "A stopping time problem on the positive integers". Acta Arithmetica. 30 (3): 241–252. doi:10.4064/aa-30-3-241-252. ISSN 0065-1036.
  7. "Collatz conjecture: First progress in decades in a seemingly impossible problem". Spain's News. 2020-01-09. Retrieved 2021-08-01.
  8. Roosendaal, Eric. "The Terras Theorem - On the 3x + 1 problem". Retrieved 2021-08-01.
  9. Terras, Audrey (2013). Harmonic Analysis on Symmetric Spaces—Euclidean Space, the Sphere, and the Poincare Upper Half-Plane (Second ed.). Springer. p. 67. ISBN 978-1-4614-7971-0.
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