Lars Ahlfors
From Wikipedia, the free encyclopedia
| Lars Ahlfors | |
 Lars Ahlfors
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| Born | April 18, 1907 Helsinki, Finland |
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| Died | October 11, 1996 (aged 89) |
| Nationality | Finland |
| Fields | Mathematics |
| Institutions | University of Helsinki ETH Zurich |
| Alma mater | University of Helsinki |
| Doctoral advisor | Ernst Lindelöf Rolf Nevanlinna |
| Known for | Riemann surfaces |
| Notable awards | Fields Medal (1936) Wihuri Prize (1968) Wolf Prize in Mathematics (1981) |
Lars Valerian Ahlfors (April 18, 1907 – October 11, 1996) was a Finnish mathematician, remembered for his work in the field of Riemann surfaces and his text on complex analysis.
He was born in Helsinki, the son of a Professor of Engineering. He studied at University of Helsinki from 1924, graduating in 1928 having studied under Ernst Lindelöf and Rolf Nevanlinna.
He assisted Nevanlinna in 1929 with his work on Denjoy's conjecture on the number of asymptotic values of an entire function. He completed his doctorate in 1930. Ahlfors worked as an associate professor at the University of Helsinki from 1933 to 1936.
In 1936 he was one of the first two people to be awarded the Fields Medal. In 1935 Alfors visited Harvard University. He returned to Finland in 1938 to take up a professorship at the University of Helsinki. The outbreak of war led to problems although Ahlfors was unfit for military service. He was offered a post at the Swiss Federal Institute of Technology at Zurich in 1944 and finally managed to travel there in March 1945. He did not enjoy his time in Switzerland and jumped at a chance to leave, returning to work at Harvard where he remained until he retired in 1977; he was William Caspar Graustein Professor of Mathematics from 1964. He was awarded the Wihuri Prize in 1968 and the Wolf Prize in Mathematics in 1981.
His book Complex Analysis (1953) is the classic text on the subject and is almost certainly referenced in any more recent text which makes heavy use of complex analysis. Ahlfors wrote several other significant books, including Riemann surfaces (1960) and Conformal invariants (1973). He made decisive contributions to meromorphic curves, value distribution theory, Riemann surfaces, conformal geometry, quasiconformal mappings and other areas during his career.
He married Erna Lehnert and had three daughters.
[edit] Bibliography
- Complex Analysis (1979) (ISBN 0-07-000657-1)
- Contributions to the Theory of Riemann Surfaces: Annals of Mathematics Studies (1953) (ISBN 0-691-07939-0)
- Ahlfors, Lars (Feb 1966). "Fundamental Polyhedrons and Limit Point Sets of Kleinian Groups". Proceedings of the National Academy of Sciences 55 (2): 251-254. PMID:16591331.
[edit] External links
- Ahlfors entry on Harvard University Mathematics department web site.
- Papers of Lars Valerian Ahlfors : an inventory (Harvard University Archives)
- Lars Valerian Ahlfors The MacTutor History of Mathematics page about Ahlfors
- The Mathematics of Lars Valerian Ahlfors, Notices of the American Mathematical Society; vol. 45, no. 2 (February 1998).
- Lars Valerian Ahlfors (1907–1996), Notices of the American Mathematical Society; vol. 45, no. 2 (February 1998).
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