Frédéric Ladislas Joseph Marty (23 June 1911 in

Albi Albi (; oc, Albi ) is a commune in southern France. It is the prefecture of the Tarn department, on the river Tarn, 85 km northeast of Toulouse. Its inhabitants are called ''Albigensians'' (french: Albigeois, Albigeoise(s), oc, albig ...

, Tarn – 14 June 1940, Gulf of Finland) was a French

mathematician A mathematician is someone who uses an extensive knowledge of mathematics in their work, typically to solve mathematical problems. Mathematicians are concerned with numbers, data, quantity, structure, space, models, and change. History On ...

. Frédéric Marty's father was the mathematician Joseph Marty (1885–1914), who taught at the lycée d'Albi and as a French army officer was killed in action in WW I. Frédéric Marty received his doctorate in 1931 from the

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, S ...

(ENS). After that he was a ''

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 ...

'' at

Aix-Marseille University Aix-Marseille University (AMU; french: Aix-Marseille Université; formally incorporated as ''Université d'Aix-Marseille'') is a public research university located in the Provence region of southern France. It was founded in 1409 when Louis II o ...

. He was a French Air Force lieutenant in WW II and was a victim of the Aero Flight 1631 shootdown when he was a diplomatic courier on board a Finnish plane that was shot down by the

Soviet Air Force The Soviet Air Forces ( rus, Военно-воздушные силы, r=Voyenno-vozdushnyye sily, VVS; literally "Military Air Forces") were one of the air forces of the Soviet Union. The other was the Soviet Air Defence Forces. The Air Forces ...

. Marty is known in the theory of normal families for Marty's theorem. This theorem from his dissertation states that for any family

F

meromorphic function In the mathematical field of complex analysis, a meromorphic function on an open subset ''D'' of the complex plane is a function that is holomorphic on all of ''D'' ''except'' for a set of isolated points, which are poles of the function. The ...

F

is normal if and only if

F

's derived family of spherical derivatives is locally bounded. Marty also founded the theory of hypergroups and

hyperstructure Hyperstructures are algebraic structures equipped with at least one multi-valued operation, called a ''hyperoperation''. The largest classes of the hyperstructures are the ones called Hv – structures. A hyperoperation (\star) on a nonempty set ...

s. He was an invited speaker at the

International Congress of Mathematics The International Congress of Mathematicians (ICM) is the largest conference for the topic of mathematics. It meets once every four years, hosted by the International Mathematical Union (IMU). The Fields Medals, the Nevanlinna Prize (to be rename ...

(ICM) 1936 in

Oslo Oslo ( , , or ; sma, Oslove) is the capital and most populous city of Norway. It constitutes both a county and a municipality. The municipality of Oslo had a population of in 2022, while the city's greater urban area had a population ...

References

{{DEFAULTSORT:Marty, Frederic 1911 births 1940 deaths 20th-century French mathematicians Complex analysts French military personnel killed in World War II École Normale Supérieure alumni Academic staff of Aix-Marseille University Victims of aviation accidents or incidents in Finland Victims of aircraft shootdowns French Air Force personnel of World War II