Jan-Erik Ingvar Roos (October 16, 1935 – December 15, 2017) was a Swedish mathematician. He was born in Halmstad, in the province of Halland on the Swedish west coast. Roos enrolled at Lund University in 1954, and started studying mathematics with Lars Gårding in 1957. Under Gårding's direction he wrote a thesis on ordinary differential equation, and graduated in 1958 with a licentiate degree. Later that year he went to Paris on a doctoral scholarship; there, he gravitated towards the mathematical environment at the Institut Henri Poincaré, and the various seminars held there. After a while he started attending Alexander Grothendieck's seminar at the Institut des hautes études scientifiques in Bures-sur-Yvette, where he became interested in abstract algebra and algebraic geometry. In 1967
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| - Jan-Erik Ingvar Roos, född 16 oktober 1935, död 15 december 2017 i Uppsala, var en svensk matematiker. Jan-Erik Roos var professor emeritus i matematik vid Stockholms universitet. Han blev 1981 ledamot av Vetenskapsakademien. Roos studerade för Alexander Grothendieck i Paris och arbetade med frågeställningar inom homologisk algebra. Bland annat studerade han härledda funktorer till lim-funktorn. Senare i sin karriär intresserade han sig för betydligt mer konkreta problem inom algebran, och gjorde bland annat omfattande datoralgebraiska studier av och deras rationalitet. Roos är en av mycket få i Sverige som nått professors titel inom ett traditionellt akademiskt ämne utan att ha doktorerat. Han är begravd på Uppsala gamla kyrkogård. (sv)
- Jan-Erik Ingvar Roos (October 16, 1935 – December 15, 2017) was a Swedish mathematician. He was born in Halmstad, in the province of Halland on the Swedish west coast. Roos enrolled at Lund University in 1954, and started studying mathematics with Lars Gårding in 1957. Under Gårding's direction he wrote a thesis on ordinary differential equation, and graduated in 1958 with a licentiate degree. Later that year he went to Paris on a doctoral scholarship; there, he gravitated towards the mathematical environment at the Institut Henri Poincaré, and the various seminars held there. After a while he started attending Alexander Grothendieck's seminar at the Institut des hautes études scientifiques in Bures-sur-Yvette, where he became interested in abstract algebra and algebraic geometry. In 1967 (en)
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| - Jan-Erik Ingvar Roos (October 16, 1935 – December 15, 2017) was a Swedish mathematician. He was born in Halmstad, in the province of Halland on the Swedish west coast. Roos enrolled at Lund University in 1954, and started studying mathematics with Lars Gårding in 1957. Under Gårding's direction he wrote a thesis on ordinary differential equation, and graduated in 1958 with a licentiate degree. Later that year he went to Paris on a doctoral scholarship; there, he gravitated towards the mathematical environment at the Institut Henri Poincaré, and the various seminars held there. After a while he started attending Alexander Grothendieck's seminar at the Institut des hautes études scientifiques in Bures-sur-Yvette, where he became interested in abstract algebra and algebraic geometry. In 1967 he was invited by Saunders Mac Lane to visit the University of Chicago for three months; Mac Lane was impressed by Roos and later wrote a very positive letter of recommendation for him. Upon his return to Sweden, Roos was appointed Professor of Mathematics at Stockholm University in 1970, and started building a strong algebra school. He was elected to the Royal Swedish Academy of Sciences in 1980 and was its President from 1980 to 1982. While serving on the Academy, he was on the committees deciding the Rolf Schock Prizes in Mathematics and the Crafoord Prize in Astronomy and Mathematics. Roos made important contributions to homological algebra, and did extensive computer-assisted studies of Hilbert–Poincaré series and their rationality. A special issue of the journal Homology, Homotopy and Applications ("The Roos Festschrift volume") was published in 2002, on the occasion of his 65th birthday. He died December 15, 2017 at his home in Uppsala and is buried at the Uppsala old cemetery. (en)
- Jan-Erik Ingvar Roos, född 16 oktober 1935, död 15 december 2017 i Uppsala, var en svensk matematiker. Jan-Erik Roos var professor emeritus i matematik vid Stockholms universitet. Han blev 1981 ledamot av Vetenskapsakademien. Roos studerade för Alexander Grothendieck i Paris och arbetade med frågeställningar inom homologisk algebra. Bland annat studerade han härledda funktorer till lim-funktorn. Senare i sin karriär intresserade han sig för betydligt mer konkreta problem inom algebran, och gjorde bland annat omfattande datoralgebraiska studier av och deras rationalitet. Roos är en av mycket få i Sverige som nått professors titel inom ett traditionellt akademiskt ämne utan att ha doktorerat. Han är begravd på Uppsala gamla kyrkogård. (sv)
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