Rodion Kuzmin
Appearance
Rodion Kuzmin | |
---|---|
Saint Petersburg State Polytechnical University | |
Doctoral advisor | James Victor Uspensky |
Rodion Osievich Kuzmin (
Leningrad) was a Soviet mathematician, known for his works in number theory and analysis.[1] His name is sometimes transliterated as Kusmin. He was an Invited Speaker of the ICM in 1928 in Bologna.[2]
Selected results
- In 1928, Kuzmin solved[3] the following problem due to Gauss (see Gauss–Kuzmin distribution): if x is a random number chosen uniformly in (0, 1), and
- is its continued fraction expansion, find a bound for
- where
- Gauss showed that Δn tends to zero as n goes to infinity, however, he was unable to give an explicit bound. Kuzmin showed that
- where C,α > 0 are numerical constants. In 1929, the bound was improved to C 0.7n by Paul Lévy.
- In 1930, Kuzmin provedquadratic irrational, are transcendental. In particular, this result implies that Gelfond–Schneider constant
- is transcendental. See Gelfond–Schneider theorem for later developments.
- He is also known for the Kusmin-Landau inequality: If is continuously differentiable with monotonic derivative satisfying (where denotes the Nearest integer function) on a finite interval , then
Notes
- ^ Venkov, B. A.; Natanson, I. P. "R. O. Kuz'min (1891–1949) (obituary)". Uspekhi Matematicheskikh Nauk. 4 (4): 148–155.
- ^ Kuzmin, R. "Sur un problème de Gauss." In Atti del Congresso Internazionale dei Matematici: Bologna del 3 al 10 de settembre di 1928, vol. 6, pp. 83–90. 1929.
- ^ Kuzmin, R.O. (1928). "On a problem of Gauss". Dokl. Akad. Nauk SSSR: 375–380.
- ^ Kuzmin, R. O. (1930). "On a new class of transcendental numbers". Izvestiya Akademii Nauk SSSR (Math.). 7: 585–597.
External links
- Rodion Kuzmin at the Mathematics Genealogy Project (The chronology there is apparently wrong, since J. V. Uspensky lived in USA from 1929.)