View source for Biography:Johannes Knoblauch

{{Short description|German mathematician}}
[[File:Johannes Knoblauch.jpg|thumb|right|{{center|Johannes Knoblauch}}]]
'''Johannes Knoblauch''' (27 August 1855, Halle (Saale) – 22 July 1915, [[Place:Berlin|Berlin]]) was a German mathematician.<ref>{{cite web|title=Biografie, Johannes Knoblauch|website=Wissenschaftliche Sammlungen, Humboldt Universität zu Berlin|url=http://www.sammlungen.hu-berlin.de/dokumente/15944/}}</ref>

==Biography==
Johannes Knoblauch, whose father was the physics professor [[Biography:Hermann Knoblauch|Karl Hermann Knoblauch]], studied law, mathematics and physics from 1872 in Halle, Heidelberg and Berlin. At the Friedrich Wilhelm University (later renamed the Humboldt University of Berlin) he studied from 1874 to 1878 and from 1880 to 1883 and received his ''Promotion'' (Ph.D.) in 1882 and his ''[[Social:Habilitation|Habilitation]]'' in 1883.<ref name=NDB>{{NDB|12|194|195|Knoblauch, Johannes|Ingrid Ahrens|116257989}}</ref> His doctoral dissertation "Ueber die Allgemeine Wellenfläche" was supervised by [[Biography:Karl Weierstrass|Karl Weierstrass]].<ref>{{cite journal|author=Knoblauch, Johannes|title=Ueber die allgemeine Wellenfläche|website=Humboldt-Universität zu Berlin|year=1882 |url=https://edoc.hu-berlin.de/handle/18452/843|doi=10.18452/191}}</ref><ref>{{MathGenealogy|id=9716|name=Johanness Knoblauch}}</ref> Knoblauch was a teacher for the academic year 1878–1879 at (his former school) the state ''Gymnasium'' in Halle and from 1879 to 1880 at Berlin's ''Gymnasium zum Grauen Kloster''. At the Friedrich Wilhelm University of Berlin, after his ''Habilitation'' in 1883 he was appointed [[Social:Privatdozent|Privatdozent]]. There in 1889 he was appointed professor extraordinarius and retained that academic post until his death.<ref name=NDB/> From 1883 to 1885 his friend Heinrich von Stein stayed with him in the ''Knoblauch-Haus'' at Poststrasse 23.<ref> Markus Bernauer: "Heinrich von Stein." Walter de Gruyter, 1998, {{ISBN|3-11-016181-8}}, pp. 65 & 204 ([https://books.google.com/books?id=TJ1IOunzDogC&pg=PA204 e-book])</ref> In 1906/07 Knoblauch worked with Kazimierz Żorawski on new [[Group theory|group theoretical]] methods.<ref>[[Biography:Karin Reich|Karin Reich]]: "The development of the tensor calculus." Birkhäuser, 1994, {{ISBN|3-7643-2814-2}}, p. 104 ([https://books.google.com/books?id=O6lixBzbc0gC&pg=PA104 e-book])</ref>

Knoblauch was a founding member of the Berlin Mathematical Society. For 13 years he was a member of the editorial board of the ''[[Crelle's Journal]]''.

[[File:St.-Marien- und St.-Nicolai-Friedhof Pankow Okt. 2016 - 21.jpg|thumb|{{center|Gravesite}}]]
In 1884 he married Luise ''née'' Eyssenhardt (1865–1940).<ref name=NDB/> The grave of the married couple is in the cemetery ''Alter Friedhof der St.-Nikolai- und St.-Marien-Gemeinde'' in the Pankow borough of Berlin.<ref>{{cite web|title=Grave of Johannes Knoblauch in Berlin-Friedrichshain|url=http://www.w-volk.de/museum/grave65.htm}}</ref>

==Selected publications==
* ''Theorie der algebraischen Curven und Flächen höherer Ordnung.'' 1885
* [https://books.google.com/books?id=Qk07AQAAIAAJ ''Einleitung in die allgemeine Theorie der krummen Flächen'']. 1888
* [https://archive.org/details/grundlagenderdi00knobgoog/page/n5/mode/2up  ''Grundlagen der Differentialgeometrie'']. 1913
* ''Ueber Biegungscovarianten.'' 1892. {{doi|10.1515/crll.1893.111.277}}
* ''Vorlesungen über die Theorie der Elliptischen Functionen''. 1913
* ''Die Biegungs-Invarianten und Kovarianten von gegebener Ordnung.'' 1906. {{doi|10.1515/crll.1906.131.247}}
* ''Ein Bildnis Leonhard Eulers in Privatbesitz.'' 1911
* ''Die Differentialgleichung der Flächen mit isometrischen Krümmungslinien.'' 1912
===As an editor===
* ''Mathematische Werke von Karl Weierstrass'', edited by Johannes Knoblauch, Georg Hettner, and Rudolf Rothe
** ''[http://name.umdl.umich.edu/AAN8481.0001.001 Abhandlungen-1]'', Math. Werke. vol. 1. Berlin, 1894
** ''[http://name.umdl.umich.edu/AAN8481.0002.001 Abhandlungen-2]'', Math. Werke. vol. 2. Berlin, 1895
** ''[http://name.umdl.umich.edu/AAN8481.0003.001 Abhandlungen-3]'', Math. Werke. vol. 3. Berlin, 1903
** ''[http://name.umdl.umich.edu/AAN8481.0004.001 Vorl. ueber die Theorie der Abelschen Transcendenten]'', Math. Werke. Bd. 4. Berlin, 1902
** ''[http://name.umdl.umich.edu/AAN8481.0007.001 Vorl. ueber Variationsrechnung]'', Math. Werke. vol. 7. Leipzig, 1927

==Further reading==
* Rudolf Rothe: ''Johannes Knoblauch zum Gedächtnis: Nachruf geh. am 31. Juli 1915 im Matemat. Verein an d. Univ. Berlin.''
* Rudolf Rothe: ''Zur Erinnerung an Johannes Knoblauch'', Jahresbericht DMV 1915, [http://gdz.sub.uni-goettingen.de/dms/load/img/?PPN=GDZPPN002125064 Online]
* Martin Breslauer: ''Besitz des Herrn. Dr. Johannes Knoblauch.'' 1926

==References==
<references/>

{{DEFAULTSORT:Knoblauch, Johannes}}
[[Category:Differential geometers]]

{{Sourceattribution|Johannes Knoblauch}}