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- Johan Frederik Steffensen (28 February 1873, in Copenhagen – 20 December 1961) was a Danish mathematician, statistician, and actuary who did research in the fields of calculus of finite differences and interpolation. He was professor of actuarial science at the University of Copenhagen from 1923 to 1943. Steffensen's inequality and Steffensen's method (an iterative numerical method) are named after him. He was an Invited Speaker at the 1912 International Congress of Mathematicians (ICM) in Cambridge, England and at the 1924 ICM in Toronto. ... His more important works included the theory of statistics (1923), interpolation (1925), insurance mathematics (1934) and the calculation of interest (1936). ... He was President of the Danish Actuarial Society in 1922-24 and 1930-33, and of the Danish Mathematical Society in 1930-36 ... (en)
- Johan Frederik Steffensen (28 février 1873 à Copenhague - 20 décembre 1961) est un mathématicien, statisticien et actuaire danois qui a effectué des recherches dans les domaines du calcul des différences finies et de l'interpolation. Il a été professeur de science actuarielle à l'Université de Copenhague de 1923 à 1943. L'inégalité de Steffensen et (une méthode numérique itérative) portent son nom. (fr)
- Johan Frederik Steffensen (Copenhague, 28 de fevereiro de 1873 – 20 de dezembro de 1961) foi um matemático, estatístico e atuário dinamarquês, que conduziu pesquisas nas áreas de diferenças finitas e interpolação. Foi professor de ciências atuariais de 1923 a 1943 na Universidade de Copenhague. (pt)
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- 3263 (xsd:nonNegativeInteger)
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- Johan Frederik Steffensen (28 février 1873 à Copenhague - 20 décembre 1961) est un mathématicien, statisticien et actuaire danois qui a effectué des recherches dans les domaines du calcul des différences finies et de l'interpolation. Il a été professeur de science actuarielle à l'Université de Copenhague de 1923 à 1943. L'inégalité de Steffensen et (une méthode numérique itérative) portent son nom. (fr)
- Johan Frederik Steffensen (Copenhague, 28 de fevereiro de 1873 – 20 de dezembro de 1961) foi um matemático, estatístico e atuário dinamarquês, que conduziu pesquisas nas áreas de diferenças finitas e interpolação. Foi professor de ciências atuariais de 1923 a 1943 na Universidade de Copenhague. (pt)
- Johan Frederik Steffensen (28 February 1873, in Copenhagen – 20 December 1961) was a Danish mathematician, statistician, and actuary who did research in the fields of calculus of finite differences and interpolation. He was professor of actuarial science at the University of Copenhagen from 1923 to 1943. Steffensen's inequality and Steffensen's method (an iterative numerical method) are named after him. He was an Invited Speaker at the 1912 International Congress of Mathematicians (ICM) in Cambridge, England and at the 1924 ICM in Toronto. (en)
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- Johan Frederik Steffensen (fr)
- Johan Frederik Steffensen (en)
- Johan Frederik Steffensen (pt)
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