Christian Juel (mathematician)
Christian Sophus Juel (born January 25, 1855 in Randers , † January 24, 1935 in Copenhagen ) was a Danish mathematician who dealt with geometry.
Life
Juel was the son of a judge, but lost his father when he was one year old. He went to school in Svendborg and studied from 1871 at the Polytechnic in Copenhagen and from 1876 mathematics at the University of Copenhagen . In 1879 he graduated and in 1885 he received his doctorate with a geometrical work (Inledning i de imaginaer linies og den imaginaer plans geometry). From 1894 he taught at the Polytechnic, where he received a full professorship in 1897. He also taught at the university.
He worked on projective geometry (where he started from Karl von Staudt and independently came to similar results as Corrado Segre ), algebraic curves, polyhedra and oval surfaces. In addition to a monograph on projective geometry, he also published several school books. In 1897 he discovered that the Dane Caspar Wessel was the first to publish a geometric interpretation of complex numbers.
From 1889 to 1915 he was editor of the Matematisk Tidsskrift. In 1929 he was awarded an honorary doctorate in Oslo and in 1925 an honorary member of the Mathematical Association.
He married the daughter of the mathematics and astronomy professor Thorvald Nicolai Thiele .
Fonts
- Lectures on projective geometry with special consideration of von Staudt's imaginary theory , basic teaching of mathematical sciences , Springer Verlag 1934, online
- Lectures on mathematics for chemists , Copenhagen 1890
- Elementar stereometri , Copenhagen, 1896
- Analytisk stereometri , Copenhagen, 1897
- Ren og anvendt aritmetik , Copenhagen 1902
- Forlaesinger over rationel mekanik , Copenhagen 1913, 2nd edition 1920
- Basic structure of projective geometry , Acta Mathematica, Volume 14, 1890, online
- About the parameter determination of points on curves of the 2nd and 3rd order. A geometric introduction to the theory of logarithmic and elliptical functions , Mathematische Annalen, Volume 47, 1896, 72-104 Online
literature
- Herbert Oettel in Dictionary of Scientific Biography
- David Fog, obituary in Matematisk Tidsskrift 1935
Individual evidence
- ↑ Christian Sophus Juel gravsted.dk Danish language
Web links
- John J. O'Connor, Edmund F. Robertson : Christian Juel (mathematician). In: MacTutor History of Mathematics archive .
| personal data | |
|---|---|
| SURNAME | Juel, Christian |
| ALTERNATIVE NAMES | Juel, Christian Sophus |
| BRIEF DESCRIPTION | Danish mathematician |
| DATE OF BIRTH | January 25, 1855 |
| PLACE OF BIRTH | Randers |
| DATE OF DEATH | January 24, 1935 |
| Place of death | Copenhagen |