Johan Frederik Steffensen Explained

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.^[1] 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.^[2]

Publications

• Book: Factorial moments and discontinuous frequency-functions. 1923. Almqvist & Wiksells Boktryckeri-A.B. Uppsala.

  89 pages

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• Book: Interpolation. 1927. Williams & Wilkins. London. ^[3]

Obituary

• Nordlund N. E. . 1962 . Johan Frederik Steffensen in memoriam . Nordisk Matematisk Tidsskrift . 10 . 105–107 .

External links

• Johan Frederik Steffensen papirer (Danish)

Notes and References

1. Review of (1) Interpolation Formulas, with one and more variables. Pp. 26; (2) Factorial Moments and Discontinuous Frequency Functions. Pp. 17. By J. F. Steffensen, Ph.D., [Reprinted from Skandinavisk Aktuarietidskrift. Upsala. 1923.]]. Journal of the Institute of Actuaries. 54. 3. 2016. 301–302. 0020-2681. 10.1017/S0020268100030341.
2. Web site: Steffensen, J. F.. ICM Plenary and Invited Speakers.
3. Longley, W. R.. Review of Interpolation by J. F. Steffensen and Numerische Infinitesmalrechnung by Martin Lindow. Bull. Amer. Math. Soc.. 1928. 34. 5. 674–675. 10.1090/S0002-9904-1928-04674-8. free.