Johannes Knoblauch (27 August 1855,

Halle (Saale) Halle (Saale), or simply Halle (), is the second largest city of the States of Germany, German state of Saxony-Anhalt. It is the sixth-most populous city in the area of former East Germany after (East Berlin, East) Berlin, Leipzig, Dresden, Chem ...

– 22 July 1915,

Berlin Berlin ( ; ) is the Capital of Germany, capital and largest city of Germany, by both area and List of cities in Germany by population, population. With 3.7 million inhabitants, it has the List of cities in the European Union by population withi ...

) was a German mathematician.

Biography

Johannes Knoblauch, whose father was the physics professor 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 The Humboldt University of Berlin (, abbreviated HU Berlin) is a public research university in the central borough of Mitte in Berlin, Germany. The university was established by Frederick William III on the initiative of Wilhelm von Humbol ...

) he studied from 1874 to 1878 and from 1880 to 1883 and received his ''Promotion'' (Ph.D.) in 1882 and his ''

Habilitation Habilitation is the highest university degree, or the procedure by which it is achieved, in Germany, France, Italy, Poland and some other European and non-English-speaking countries. The candidate fulfills a university's set criteria of excelle ...

'' in 1883. His doctoral dissertation "Ueber die Allgemeine Wellenfläche" was supervised by

Karl Weierstrass Karl Theodor Wilhelm Weierstrass (; ; 31 October 1815 – 19 February 1897) was a German mathematician often cited as the " father of modern analysis". Despite leaving university without a degree, he studied mathematics and trained as a school t ...

. 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

Privatdozent ''Privatdozent'' (for men) or ''Privatdozentin'' (for women), abbreviated PD, P.D. or Priv.-Doz., is an academic title conferred at some European universities, especially in German-speaking countries, to someone who holds certain formal qualifi ...

. There in 1889 he was appointed professor extraordinarius and retained that academic post until his death. From 1883 to 1885 his friend Heinrich von Stein stayed with him in the ''Knoblauch-Haus'' at Poststrasse 23. In 1906/07 Knoblauch worked with Kazimierz Żorawski on new group theoretical methods. 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 ''Crelle's Journal'', or just ''Crelle'', is the common name for a mathematics journal, the ''Journal für die reine und angewandte Mathematik'' (in English: ''Journal for Pure and Applied Mathematics''). History The journal was founded by A ...

''.

In 1884, he married Luise ''née'' Eyssenhardt (1865–1940). The grave of the married couple is in the cemetery ''Alter Friedhof der St.-Nikolai- und St.-Marien-Gemeinde'' in the

Pankow Pankow () is the second largest and most populous Boroughs and quarters of Berlin, borough of the German capital Berlin. In Berlin's 2001 administrative reform, it was merged with the former boroughs of Prenzlauer Berg and Weissensee (Berlin), W ...

borough of Berlin.

Selected publications

* ''Theorie der algebraischen Curven und Flächen höherer Ordnung.'' 1885
''Einleitung in die allgemeine Theorie der krummen Flächen''
1888
''Grundlagen der Differentialgeometrie''
1913 * ''Ueber Biegungscovarianten.'' 1892. * ''Vorlesungen über die Theorie der Elliptischen Functionen''. 1913 * ''Die Biegungs-Invarianten und Kovarianten von gegebener Ordnung.'' 1906. * ''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 **
Abhandlungen-1
', Math. Werke. vol. 1. Berlin, 1894 **
Abhandlungen-2
', Math. Werke. vol. 2. Berlin, 1895 **
Abhandlungen-3
', Math. Werke. vol. 3. Berlin, 1903 **
Vorl. ueber die Theorie der Abelschen Transcendenten
', Math. Werke. Bd. 4. Berlin, 1902 **
Vorl. ueber Variationsrechnung
', Math. Werke. vol. 7. Leipzig, 1927

References

{{DEFAULTSORT:Knoblauch, Johannes 19th-century German mathematicians 20th-century German mathematicians Differential geometers Humboldt University of Berlin alumni Academic staff of the Humboldt University of Berlin 1855 births 1915 deaths

Biography

Selected publications

As an editor

Further reading

References