Frédéric Ladislas Joseph Marty (23 June 1911 in

Albi Albi (; ) is a commune in France, commune in southern France. It is the prefecture of the Tarn (department), Tarn Departments of France, department, on the river Tarn (river), Tarn, 85 km northeast of Toulouse. Its inhabitants are called ...

, Tarn – 14 June 1940,

Gulf of Finland The Gulf of Finland (; ; ; ) is the easternmost arm of the Baltic Sea. It extends between Finland to the north and Estonia to the south, to Saint Petersburg—the second largest city of Russia—to the east, where the river Neva drains into it. ...

) 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, mathematical structure, structure, space, Mathematica ...

. 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 or Ecole may refer to: * an elementary school in the French educational stages normally followed by Secondary education in France, secondary education establishments (collège and lycée) * École (river), a tributary of the Seine flowing i ...

(ENS). After that he was a ''

maître de conférences The following summarizes basic academic ranks in the France, French higher education system. Most academic institutions are state-run and most academics with permanent positions are French Civil Service, civil servants, and thus are Academic tenur ...

'' at

Aix-Marseille University Aix-Marseille University (AMU; ; formally incorporated as ) is a Public university, public research university located in the Provence region of southern France. It was founded in 1409 when Louis II of Anjou, List of rulers of Provence, Count of ...

. He was a

French Air Force The French Air and Space Force (, , ) is the air force, air and space force of the French Armed Forces. Formed in 1909 as the ("Aeronautical Service"), a service arm of the French Army, it became an independent military branch in 1934 as the Fr ...

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 (, VVS SSSR; literally "Military Air Forces of the Union of Soviet Socialist Republics"; initialism VVS, sometimes referred to as the "Red Air Force") were one of the air forces of the Soviet Union. The other was the Sovie ...

. 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. ...

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 IMU Abacus Medal (known before ...

(ICM) 1936 in

Oslo Oslo ( or ; ) 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 of 1,064,235 in 2022 ...

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 Victims of aviation accidents or incidents in 1940