Nikola Obreschkow
Nikola Dimitrow Obreschkow , often quoted by Obrechkoff, ( Bulgarian: Никола Димитров Обрешков , born March 6, 1896 in Varna ; † August 11, 1963 ibid) was a Bulgarian mathematician .
Life
Obreschkow studied mathematics and physics in Sofia . In 1922/23 he deepened his studies in Berlin . He received his doctorate in 1932 at the University of Palermo with a thesis on Borel summability and again a year later in 1933 at the Sorbonne with a dissertation on divergent series, which was published in the journal Acta Mathematica . From 1920 he taught at the University of Sofia, where he became an associate professor in 1925 and a full professor in 1928. From 1928 until his death he was head of the algebra department at the university. From 1951 to 1963 he was director of the Mathematical Institute of the Bulgarian Academy of Sciences , of which he had been a member since 1945.
In his scientific work he dealt with higher algebra , number theory , probability theory and the theory of divergent series as well as numerical methods. He was considered a master of classical analysis and was particularly concerned with the summability of divergent series and the distribution of the zeros of polynomials. In particular, he generalized Descartes' rule of signs to complex roots.
He gave lectures at the international mathematics congresses in Bologna in 1928 (Sur la sommation de la série de Taylor sur le contour du domaine de sommabilité par les diverses méthodes) and in Oslo in 1936 (Sur les fonctions meromorphes limites de fonctions rationelles). He was visiting professor at the universities of Hamburg, Berlin, Geneva, Rome, Palermo, Leipzig and Dresden.
He was awarded the Georgi Dimitrov Order and the Dimitrov Prize. In Burgas the scientific and mathematical high school Akademik Nikola Obreschkow is named after him.
Fonts
- N. Obrechkoff: Distribution and calculation of the zeros of real polynomials, VEB Deutscher Verlag der Wissenschaften, Berlin, 1963
literature
- Obreschkow, Nikola Dimitrov . In: Taschenlexikon Bulgaria , Bibliographisches Institut Leipzig 1983, page 135.
Web links
Individual evidence
- ↑ Nikola Obreschkow in the Mathematics Genealogy Project (English)
| personal data | |
|---|---|
| SURNAME | Obreschkov, Nikola |
| ALTERNATIVE NAMES | Obreschkow, Nikola Dimitrov (full name); Обрешков, Никола Димитров (Bulgarian); Obrechkoff, Nikola |
| BRIEF DESCRIPTION | Bulgarian mathematician |
| DATE OF BIRTH | March 6, 1896 |
| PLACE OF BIRTH | Varna |
| DATE OF DEATH | August 11, 1963 |
| Place of death | Varna |