Jules Haag (9 August 1882,

Flirey Flirey () is a commune in the Meurthe-et-Moselle department in north-eastern France. Birthplace of Rin Tin Tin Following advances made by American forces during the Battle of Saint-Mihiel, Corporal Lee Duncan, an aerial gunner of the U.S. Army A ...

– 16 February 1953,

Besançon Besançon (, , , ; archaic german: Bisanz; la, Vesontio) is the prefecture of the department of Doubs in the region of Bourgogne-Franche-Comté. The city is located in Eastern France, close to the Jura Mountains and the border with Switzerl ...

) was a French mathematician and

horologist Horology (; related to Latin '; ; , interfix ''-o-'', and suffix ''-logy''), . is the study of the measurement of time. Clocks, watches, clockwork, sundials, hourglasses, clepsydras, timers, time recorders, marine chronometers, and atomic clo ...

Education and career

Haag matriculated at l'

École Normale Supérieure École may refer to: * an elementary school in the French educational stages normally followed by secondary education establishments (collège and lycée) * École (river), a tributary of the Seine flowing in région Île-de-France * École, Savoi ...

in 1903Haag, Jules - Observatoire de Haute-Provence
and successfully qualified for the ''

agrégation In France, the ''agrégation'' () is a competitive examination for civil service in the French public education system. Candidates for the examination, or ''agrégatifs'', become ''agrégés'' once they are admitted to the position of ''professe ...

'' of mathematics in 1906. He received in 1910 his doctorate in mathematics from the

University of Paris , image_name = Coat of arms of the University of Paris.svg , image_size = 150px , caption = Coat of Arms , latin_name = Universitas magistrorum et scholarium Parisiensis , motto = ''Hic et ubique terrarum'' (Latin) , mottoeng = Here and a ...

with dissertation ''Families de Lamé, composées de surfaces égales: généralisations, applications'' under the supervision of

Gaston Darboux Jean-Gaston Darboux FAS MIF FRS FRSE (14 August 1842 – 23 February 1917) was a French mathematician. Life According this birth certificate he was born in Nîmes in France on 14 August 1842, at 1 am. However, probably due to the midni ...

. Haag was professor of ''mathématiques spéciales'' at the

lycée In France, secondary education is in two stages: * ''Collèges'' () cater for the first four years of secondary education from the ages of 11 to 15. * ''Lycées'' () provide a three-year course of further secondary education for children between ...

Douai Douai (, , ,; pcd, Doï; nl, Dowaai; formerly spelled Douay or Doway in English) is a city in the Nord département in northern France. It is a sub-prefecture of the department. Located on the river Scarpe some from Lille and from Arras, D ...

from 1906 to 1908. At the science faculty of

Clermont-Ferrand Clermont-Ferrand (, ; ; oc, label=Auvergnat (dialect), Auvergnat, Clarmont-Ferrand or Clharmou ; la, Augustonemetum) is a city and Communes of France, commune of France, in the Auvergne-Rhône-Alpes regions of France, region, with a population ...

, he became in 1910 ''

maître de conférences ''Maître'' (spelled ''Maitre'' according to post-1990 spelling rules) is a commonly used honorific for lawyers, judicial officers and notaries in France, Belgium, Switzerland and French-speaking parts of Canada. It is often written in its abbrev ...

'' in astronomy and in 1910 professor of rational mechanics. During WWI, Haag worked in French marine artillery center in Gavres. Haag was an Invited Speaker of the ICM in 1924 at Toronto and in 1932 at Zurich.

References

{{DEFAULTSORT:Haag, Jules 20th-century French mathematicians 1882 births 1953 deaths