Arnold Droz-Farny

Arnold Droz-Farny
Born	(1856-02-12)12 February 1856 La Chaux-de-Fonds, Switzerland
Died	14 January 1912(1912-01-14) (aged 55) Porrentruy, Switzerland
Alma mater	University of Munich
Spouse	Lina Farny
Parent(s)	Édouard and Louise Droz
Scientific career
Fields	Mathematics
Institutions	Lycée Cantonal de Porrentruy

Arnold Droz-Farny (12 February 1856 – 14 January 1912) was a Swiss mathematician, professor in High School of Porrentruy (near Basel).

Life and work

Arnold Droz changed his family name later in his life when he married Lisa Farny. He studied in the high school of Neuchâtel and then in the Technical School of Stuttgart and in the university of Munich. After graduating in mathematics in Munich, he began to teach in a private school. Soon, in 1880, he was appointed to the chair of mathematics in the Lycée Cantonal of Porrentruy, where he remained till 1908 when his ill health forced him to retire.

In mathematical world he is known by a theorem, the Droz-Farny line theorem, stated by him in 1899, without proof, in an answer to question 14111 in the journal The Educational Times.

Droz-Farny was also an amateur numismatic collector who published some articles on historical remarks of some coins and, after his death, he donated his collection to the cantonal authorities.

Bibliography

• Aymé, Jean Louis (2004). "A Purely Synthetic Proof of the Droz-Farny Line Theorem" (PDF). Forum Geometricorum. 4: 217–224. ISSN 1534-1178. {{cite journal}}: Invalid |ref=harv (help)
• Bahn, Joahnn Rudolf (1917). Anzeiger für schweizerische altertumskunde. Antiquarische Gesellschaft in Zürich. {{cite book}}: Invalid |ref=harv (help)
• M., A. (1912). "Arnold Droz-Farny". Revue suisse de numismatique (in French). 18: 344–346. doi:10.5169/seals-172695. ISSN 0035-4163. {{cite journal}}: Invalid |ref=harv (help)

External links

• O'Connor, John J.; Robertson, Edmund F., "Arnold Droz-Farny", MacTutor History of Mathematics Archive, University of St Andrews