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- جاكوب نيلسن (بالدنماركية: Jakob Nielsen) هو رياضياتي دنماركي، ولد في 15 أكتوبر 1890 في Nordslesvig في الدنمارك، وتوفي في 3 أغسطس 1959 في هيليسينكور في الدنمارك. (ar)
- Jakob Nielsen (Mjels, 15 d'octubre de 1890 - Helsingør, 3 d'agost de 1959) va ser un matemàtic danès. (ca)
- Jakob Nielsen (* 15. Oktober 1890 in , Alsen; † 3. August 1959 in Helsingør) war ein dänischer Mathematiker, der durch seine Arbeit über Automorphismen von Flächen bekannt wurde. (de)
- Jakob Nielsen (15 October 1890 in Mjels, Als – 3 August 1959 in Helsingør) was a Danish mathematician known for his work on automorphisms of surfaces. He was born in the village Mjels on the island of Als in North Schleswig, in modern-day Denmark. His mother died when he was 3, and in 1900 he went to live with his aunt and was enrolled in the Realgymnasium. In 1907 he was expelled for membership to an illicit student club. Nevertheless, he matriculated at the University of Kiel in 1908. Nielsen completed his doctoral dissertation in 1913. Soon thereafter, he was drafted into the German Imperial Navy. He was assigned to coastal defense. In 1915 he was sent to Constantinople as a military adviser to the Turkish Government. After the war, in the spring of 1919, Nielsen married Carola von Pieverling, a German medical doctor. In 1920 Nielsen took a position at the Technical University of Breslau. The next year he published a paper in Mathematisk Tidsskrift in which he proved that any subgroup of a finitely generated free group is free. In 1926 Otto Schreier would generalize this result by removing the condition that the free group be finitely generated; this result is now known as the Nielsen–Schreier theorem. Also in 1921 Nielsen moved to the Royal Veterinary and Agricultural University in Copenhagen, where he would stay until 1925, when he moved to the Technical University in Copenhagen. He also proved the Dehn–Nielsen theorem on mapping class groups. Nielsen was a Plenary Speaker of the ICM in 1936 in Oslo. During World War II some efforts were made to bring Nielsen to the United States as it was feared that he would be assaulted by the Nazis. Nielsen would, in fact, stay in Denmark during the war without being harassed by the Nazis. In 1951 Nielsen became professor of mathematics at the University of Copenhagen, taking the position vacated by the death of Harald Bohr. He resigned this position in 1955 because of his international undertakings, in particular with UNESCO, where he served on the executive board from 1952 to 1958. (en)
- Jakob Nielsen, né le 15 octobre 1890 à Mjels, Als et décédé le 3 août 1959 à Helsingør, est un mathématicien danois, connu pour ses recherches sur les automorphismes des variétés bidimensionnelles. (fr)
- Jakob Nielsen (Mjels, 15 ottobre 1890 – Helsingør, 3 agosto 1959) è stato un matematico danese. (it)
- Jakob Nielsen foi um matemático dinamarquês, conhecido por seu trabalho sobre automorfismo de superfícies. (pt)
- Jakob Nielsen, född 15 oktober 1890, död 3 augusti 1959, var en dansk matematiker. Nielsen blev filosofie doktor i Kiel 1913. Han deltog i första världskriget, blev docent i Hamburg 1919, professor vid tekniska högskolan i Breslau 1920, docent vid Landbohøjskolen i Köpenhamn 1921 samt professor vid Polyteknisk Læreanstalt 1925. Han har författat flera arbeten om gruppteori och topologi. (sv)
- Якоб Нильсен (Jakob Nielsen; 15 октября 1890, Мьелс, Альс — 3 августа 1959, Хельсингёр) — датский математик, известен своими работами по автоморфизмам поверхностей. (ru)
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- جاكوب نيلسن (بالدنماركية: Jakob Nielsen) هو رياضياتي دنماركي، ولد في 15 أكتوبر 1890 في Nordslesvig في الدنمارك، وتوفي في 3 أغسطس 1959 في هيليسينكور في الدنمارك. (ar)
- Jakob Nielsen (Mjels, 15 d'octubre de 1890 - Helsingør, 3 d'agost de 1959) va ser un matemàtic danès. (ca)
- Jakob Nielsen (* 15. Oktober 1890 in , Alsen; † 3. August 1959 in Helsingør) war ein dänischer Mathematiker, der durch seine Arbeit über Automorphismen von Flächen bekannt wurde. (de)
- Jakob Nielsen, né le 15 octobre 1890 à Mjels, Als et décédé le 3 août 1959 à Helsingør, est un mathématicien danois, connu pour ses recherches sur les automorphismes des variétés bidimensionnelles. (fr)
- Jakob Nielsen (Mjels, 15 ottobre 1890 – Helsingør, 3 agosto 1959) è stato un matematico danese. (it)
- Jakob Nielsen foi um matemático dinamarquês, conhecido por seu trabalho sobre automorfismo de superfícies. (pt)
- Jakob Nielsen, född 15 oktober 1890, död 3 augusti 1959, var en dansk matematiker. Nielsen blev filosofie doktor i Kiel 1913. Han deltog i första världskriget, blev docent i Hamburg 1919, professor vid tekniska högskolan i Breslau 1920, docent vid Landbohøjskolen i Köpenhamn 1921 samt professor vid Polyteknisk Læreanstalt 1925. Han har författat flera arbeten om gruppteori och topologi. (sv)
- Якоб Нильсен (Jakob Nielsen; 15 октября 1890, Мьелс, Альс — 3 августа 1959, Хельсингёр) — датский математик, известен своими работами по автоморфизмам поверхностей. (ru)
- Jakob Nielsen (15 October 1890 in Mjels, Als – 3 August 1959 in Helsingør) was a Danish mathematician known for his work on automorphisms of surfaces. He was born in the village Mjels on the island of Als in North Schleswig, in modern-day Denmark. His mother died when he was 3, and in 1900 he went to live with his aunt and was enrolled in the Realgymnasium. In 1907 he was expelled for membership to an illicit student club. Nevertheless, he matriculated at the University of Kiel in 1908. Nielsen was a Plenary Speaker of the ICM in 1936 in Oslo. (en)
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- جاكوب نيلسن (أستاذ جامعي) (ar)
- Jakob Nielsen (matemàtic) (ca)
- Jakob Nielsen (Mathematiker) (de)
- Jakob Nielsen (mathématicien) (fr)
- Jakob Nielsen (mathematician) (en)
- Jakob Nielsen (matematico) (it)
- Jakob Nielsen (matemático) (pt)
- Нильсен, Якоб (математик) (ru)
- Jakob Nielsen (matematiker) (sv)
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