Riho Terras (mathematician) explained

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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.^[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]

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]

Notes and References

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