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Ludwig Schlesinger | |
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Born | |

Died | 15 December 1933 | (aged 69)

Other names | Lajos Schlesinger |

Academic background |

**Ludwig Schlesinger** (Hungarian: Lajos Schlesinger, Slovak Ľudovít Schlesinger), (1 November 1864 – 15 December 1933) was a German mathematician known for the research in the field of linear differential equations.^{[1]}

Schlesinger attended the high school in Pressburg and later studied physics and mathematics in Heidelberg and Berlin. In 1887 he received his PhD (Über lineare homogene Differentialgleichungen vierter Ordnung, zwischen deren Integralen homogene Relationen höheren als ersten Grades bestehen.) His thesis advisors were Lazarus Immanuel Fuchs and Leopold Kronecker. In 1889 he became an associate professor at Berlin; in 1897 an invited professor in Bonn and in the same year, a full professor at the University of Kolozsvár, Hungary (now Cluj, Romania). From 1911 he was professor at the University of Giessen, where he taught until 1930. His daughter Hildegard Lewy (1903–1969), became an Assyriologist and academic. In 1933 he was forced to retire by the Nazis. He died shortly afterwards.^{[2]} His doctoral students include Abraham Plessner.

Schlesinger was a historian of science. He wrote an article on the function theory of Carl Friedrich Gauss and translated René Descartes' *La Géométrie* into German (1894). He was one of the organizers of the celebrations for the hundredth anniversary of János Bolyai and from 1904 to 1909 with R. Fuchs he collected the works of his teacher Lazarus Fuchs, who was also his father-in-law. In 1902 he became a corresponding member of the Hungarian Academy of Sciences. In 1909 he received the Lobachevsky Prize.^{[3]}

From 1929 until his death he was co-editor of *Crelle's Journal*.

Like his teacher Fuchs, he worked primarily on linear ordinary differential equations. His two-volume *Handbuch der Theorie der Linearen Differentialgleichungen* was published from 1895 to 1898 in Teubner in Leipzig (Vol.2 in two parts).^{[4]} He also published *Einführung in die Theorie der gewöhnlichen Differentialgleichungen auf funktionentheoretischer Grundlage* (Auflage, 1922), *Vorlesungen über lineare Differentialgleichungen* (1908)^{[5]} and *Automorphe Funktionen* (Gruyter, 1924). In 1909 he wrote a long report for the annual report of the German Mathematical Society on the history of linear differential equations since 1865.^{[6]} He also studied differential geometry, and wrote a book of lectures on Albert Einstein's general relativity theory.^{[7]}

Today, his best known work is *Über eine Klasse von Differentialsystemen beliebiger Ordnung mit festen kritischen Punkten* (Crelle's Journal, 1912). There he considered the problem of isomonodromy deformations for a certain matrix Fuchsian equation; this is a special case of Hilbert's 21st Problem (existence of differential equations with prescribed monodromy). The paper introduced what are today called Schlesinger transformations and Schlesinger equations.

**^**Gottwald, Ilgauds, Schlote*Lexikon bedeutender Mathematiker*, Bibliographisches Institut, Leipzig 1990**^**Benda, K., ed. (1994). "Schlesinger Ludwig (Lajos)" (PDF).*Österreichisches Biographisches Lexikon 1815–1950 (ÖBL)*. Band 10. Wien: Verlag der Österreichischen Akademie der Wissenschaften. p. 196. ISBN 3-7001-2186-5. Schlesinger's son Eilhard (1909–1968) immigrated in 1933 to Argentina and became there in 1944 a professor of Greek and classical Greek culture.**^**http://www.math.wsu.edu/faculty/slapin/research/presentations/Lobachevsky.pdf**^**Bôcher, Maxime (1897). "Review:*Handbuch der Theorie der Linearen Differentialgleichungen*, by Ludwig Schlesinger".*Bull. Amer. Math. Soc*.**3**(4): 146–153. doi:10.1090/s0002-9904-1897-00387-1.**^**Wilczynski, E. J. (1910). "Review:*Vorlesungen über lineare Differentialgleichungen*, by Ludwig Schlesinger".*Bull. Amer. Math. Soc*.**16**(9): 483–489. doi:10.1090/s0002-9904-1910-01948-0.**^**Schlesinger, Ludwig (1909). "Bericht über die Entwicklung der Theorie der linearen Differentialgleichungen seit 1865".*Jahresbericht der Deutschen Mathematiker-Vereinigung*.**18**: 133–266.**^**Schlesinger, Ludwig (1920).*Raum, Zeit und Relativitätstheorie: gemeinverständliche Vorträge*. Leipzig: Teubner.

The article was created as a translation (by Google) of the corresponding article in German Wikipedia.

- Literatur von und über Ludwig Schlesinger in German National Library.
- O'Connor, John J.; Robertson, Edmund F., "Ludwig Schlesinger",
*MacTutor History of Mathematics archive*, University of St Andrews - Ludwig Schlesinger at the Mathematics Genealogy Project