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Riho Terras (mathematician)

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Estonian-American mathematician
Riho Terras
Born13 June 1939
Tartu
Died28 November 2005 (aged 66)
San Diego
Alma mater
OccupationMathematician
Employer
Awards
  • Abramowitz Award (1965)
[edit on Wikidata]

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

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

He married fellow mathematician Audrey Terras.

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. [REDACTED]
  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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