Anders Lindstedt
| Anders Lindstedt | |
|---|---|
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| Born |
27 June 1854 Dalecarlia, Sweden |
| Died | 16 May 1939 (aged 84) , Sweden |
| Residence | Sweden |
| Nationality | Swedish |
| Fields | Mathematics, astronomy and actuarial science |
| Known for | Lindstedt-Poincaré method |
Anders Lindstedt (27 June 1854 – 16 May 1939) was a Swedish mathematician, astronomer, and actuarial scientist, known for the Lindstedt-Poincaré method.
Lindstedt was born in a small village in the district of Sundborns, Dalecarlia a province in central Sweden. He obtained a PhD from the University of Lund aged 32 and was subsequently appointed as a lecturer in astronomy. He later went on to a position at the University of Dorpat (then belonging to Russia, now University of Tartu in Estonia) where he worked for around seven years on theoretical astronomy. He combined practical astronomy with an interest in theory, developing especially an interest in the three body problem This work was to influence Poincaré whose work on the three-body problem led to the discovery that there can be orbits which are nonperiodic, and yet not forever increasing nor approaching a fixed point, the beginning of what we now know as 'chaos theory'.
His papers on celestial mechanics written during that period include a technique for uniformly approximating periodic solutions to ordinary differential equations when regular perturbation approaches fail. This was later developed by Henri Poincaré and is known today as the Lindstedt–Poincaré method.
Lindstedt returned to Sweden in 1886 to take a post as professor at the Royal Institute of Technology in . During the period occupying this position, until 1909, he developed an interest in actuarial science. He made contributions to the theory of pension funds and worked as a member of government committees responsible for insurance law and social insurance. He became a corresponding member of the Institute of Actuaries in London. He was for a time Kings Inspector of insurance companies.
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