Karl Friedrich Wilhelm Rohn (January 25, 1855 in Schwanheim – August 4, 1920 in Leipzig) was a German mathematician, who studied geometry.

Life and work

Rohn studied in Darmstadt, Leipzig and Munich, initially engineering but then mathematics by the influence of

Alexander von Brill Alexander Wilhelm von Brill (20 September 1842 – 18 June 1935) was a German mathematician. Born in Darmstadt, Hesse, Brill was educated at the University of Giessen, where he earned his doctorate under supervision of Alfred Clebsch. He held a c ...

, among the others. In 1878 he received a doctorate under the supervision of

Felix Klein Christian Felix Klein (; 25 April 1849 – 22 June 1925) was a German mathematician and mathematics educator, known for his work with group theory, complex analysis, non-Euclidean geometry, and on the associations between geometry and group ...

in Munich, and in 1879 he habilitated at Leipzig. The subject of his doctoral thesis and habilitation was the Kummer surfaces of order 4 and their relationship with

hyperelliptic function In algebraic geometry, a hyperelliptic curve is an algebraic curve of genus ''g'' > 1, given by an equation of the form y^2 + h(x)y = f(x) where ''f''(''x'') is a polynomial of degree ''n'' = 2''g'' + 1 > 4 or ''n'' = 2''g'' + 2 > 4 with ''n'' dist ...

s (with Riemann surfaces of genus 2). In 1884 he became an associate professor at the University of Leipzig and a year later at the

Dresden University of Technology TU Dresden (for german: Technische Universität Dresden, abbreviated as TUD and often wrongly translated as "Dresden University of Technology") is a public research university, the largest institute of higher education in the city of Dresden, th ...

, where in 1887 he was a professor of descriptive geometry. In 1904 he became a professor at Leipzig. In addition to the Kummer surfaces, he studied algebraic space curves and completed the classification work of Georges Halphen and

Max Noether Max Noether (24 September 1844 – 13 December 1921) was a German mathematician who worked on algebraic geometry and the theory of algebraic functions. He has been called "one of the finest mathematicians of the nineteenth century". He was the ...

. In 1913 he was the president of the German Mathematical Society.

Writings

* ''Die verschiedenen Gestalten der Kummer'schen Fläche.'' In: ''Mathematische Annalen.'' 18. Band. Leipzig 1881, S. 99–159.
online
* with Erwin Papperitz
''Lehrbuch der Darstellenden Geometrie''
2 Bände, Leipzig 1893, 1896. * with L. Berzolari: ''Algebraische Raumkurven und abwickelbare Flächen.'' In: ''Enzyklopädie der mathematischen Wissenschaften.'' Erschienen 1926.
online

References

The original article was a Google translation of the corresponding German article. * * Siegfried Gottwald, Hans J. Ilgauds, Karl-Heinz Schlote (Eds):'' Encyclopedia of important mathematicians.'' Second Edition. Harri German, Frankfurt am Main 2006, . * Friedrich Schur
''Karl Rohn''
Nachruf. In: ''Jahresbericht der Deutschen Mathematiker-Vereinigung.'' 32. Band, Leipzig 1923, S. 201–211

External links

* * {{DEFAULTSORT:Rohn, Karl 19th-century German mathematicians 1855 births 1920 deaths Technische Universität Darmstadt alumni 20th-century German mathematicians