Helmut Röhrl or Rohrl (born 22 March 1927 in Straubing, died 30 January 2014) was a German mathematician. Besides complex analysis (including among other subjects the Riemann–Hilbert problem), he worked on algebra and category theory and totally convex spaces. In 1964 he edited the new edition of the classic textbook on complex analysis by Adolf Hurwitz and

Richard Courant Richard Courant (January 8, 1888 – January 27, 1972) was a German American mathematician. He is best known by the general public for the book '' What is Mathematics?'', co-written with Herbert Robbins. His research focused on the areas of real ...

. Röhrl received his doctorate in 1949 at the

Ludwig-Maximilians-Universität München The Ludwig Maximilian University of Munich (simply University of Munich or LMU; german: Ludwig-Maximilians-Universität München) is a public research university in Munich, Germany. It is Germany's sixth-oldest university in continuous operatio ...

under Robert König (and Oskar Perron) with doctoral thesis ''Über Differentialsysteme, welche aus multiplikativen Klassen mit exponentiellen Singularitäten entspringen''published in 3 parts, ''Mathematische Annalen'', vol. 123, 1951, pp. 53–75; vol. 124, 1952, pp. 187–218; vol. 125, 1953, pp. 448–466 and his habilitation in 1953 with habilitation thesis ''Abelsche Integrale auf Riemannschen Flächen endlichen Geschlechts''. He was a

docent The title of docent is conferred by some European universities to denote a specific academic appointment within a set structure of academic ranks at or below the full professor rank, similar to a British readership, a French " ''maître de con ...

in mathematics from 1949 to 1951 in Würzburg, from 1951 to 1953 in Munich, from 1953 to 1955 in Münster under

Heinrich Behnke Heinrich Adolph Louis Behnke (Horn, 9 October 1898 – Münster, 10 October 1979) was a German mathematician and rector at the University of Münster. Life and career He was born into a Lutheran family in Horn, a suburb of Hamburg. He att ...

and from 1955 to 1958 again in Munich. In the academic year 1958–1959 he was at the

University of Chicago The University of Chicago (UChicago, Chicago, U of C, or UChi) is a private university, private research university in Chicago, Illinois. Its main campus is located in Chicago's Hyde Park, Chicago, Hyde Park neighborhood. The University of Chic ...

, became in 1959 an associate professor and subsequently professor at the

University of Minnesota The University of Minnesota, formally the University of Minnesota, Twin Cities, (UMN Twin Cities, the U of M, or Minnesota) is a public land-grant research university in the Twin Cities of Minneapolis and Saint Paul, Minnesota, United States. ...

and was from 1964 a professor at the

University of California, San Diego The University of California, San Diego (UC San Diego or colloquially, UCSD) is a public land-grant research university in San Diego, California. Established in 1960 near the pre-existing Scripps Institution of Oceanography, UC San Diego is t ...

. In the academic 1962–1963 Röhrl was a visiting professor at

Harvard University Harvard University is a private Ivy League research university in Cambridge, Massachusetts. Founded in 1636 as Harvard College and named for its first benefactor, the Puritan clergyman John Harvard, it is the oldest institution of high ...

, in 1967–1968 at

Princeton University Princeton University is a private research university in Princeton, New Jersey. Founded in 1746 in Elizabeth as the College of New Jersey, Princeton is the fourth-oldest institution of higher education in the United States and one of the ...

, in 1972–1973 at the University of Munich, and at the

University of Fribourg The University of Fribourg (french: Université de Fribourg; german: Universität Freiburg) is a public university located in Fribourg, Switzerland. The roots of the university can be traced back to 1580, when the notable Jesuit Peter Canisi ...

, the

FernUniversität Hagen The University of Hagen (german: link=no, FernUniversität in Hagen, informally often referred to as FU Hagen) is a public research university that is primarily focused on distance teaching. While its main campus is located in Hagen, North Rh ...

, the

University of Göttingen The University of Göttingen, officially the Georg August University of Göttingen, (german: Georg-August-Universität Göttingen, known informally as Georgia Augusta) is a public research university in the city of Göttingen, Germany. Founded ...

, and the

Technical University Munich The Technical University of Munich (TUM or TU Munich; german: Technische Universität München) is a public research university in Munich, Germany. It specializes in engineering, technology, medicine, and applied and natural sciences. Establis ...

, and in 1976 at the

University of Nagoya , abbreviated to or NU, is a Japanese national research university located in Chikusa-ku, Nagoya. It was the seventh Imperial University in Japan, one of the first five Designated National University and selected as a Top Type university of T ...

Works

*Das Riemann-Hilbert’sche Problem der linearen Differentialgleichungen, Mathematische Annalen, vol. 133, 1957, pp. 1–25. *as annotator and editor: Adolf Hurwitz,

''Lehrbuch der Funktionentheorie'', Springer Verlag, 4th edn. 1964 **annotations (pp. 551–696) forming two new chapters: ''Weitere Abbildungstheoreme der Funktionentheorie'' (including quasiconformal mappings) and ''Holomorphe und meromorphe Funktionen auf Riemannschen Flächen'' (including the Riemann–Roch theorem, Runge approximation theorem, topology and vector bundles on Riemann surfaces, and automorphe functions) * *with Dieter Pumplün: ''Banach spaces and totally convex spaces'', parts 1, 2, Comm. in Algebra, vol. 12, 1984, pp. 935–1019; vol. 13, 1985, pp. 1047–1113

References

External links

Homepage at the UCSD
{{DEFAULTSORT:Rohrl, Helmut 20th-century German mathematicians People from Straubing 1927 births 2014 deaths Academic staff of the Technical University of Munich University of California, San Diego faculty

Works

See also

References

External links