Doctoral research completed at the University of Paris in 1923 established the analytical framework that defined Szolem Mandelbrojt’s long career in mathematics. Born in Warsaw in 1899, he moved across borders to study in Kharkiv and Paris, eventually securing a permanent place at the Collège de France where he focused on complex analysis and harmonic functions.
Academic Trajectory
Mandelbrojt received his initial education in Warsaw before relocating to the National University of Kharkiv between 1919 and 1920 to study under Sergei Bernstein. He later attended the Paris-Sorbonne University, earning his doctorate in 1923 under the supervision of Jacques Hadamard. This foundation led to a Rockefeller Fellowship in 1924 and an assistant professorship at the Rice Institute in Texas by 1926. After becoming a French citizen in 1927, he returned to Europe, teaching at the University of Lille from 1930 until 1938.
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In 1938, Mandelbrojt succeeded Hadamard at the Collège de France, holding the Chair of Analytical Mechanics and Celestial Mechanics until 1972. While he was a founding member of the Nicolas Bourbaki group in 1934, his own research diverged from abstract algebra. Instead, he concentrated on Dirichlet series, lacunary series, and entire functions. His approach aligned closely with the work of G.H. Hardy, Norbert Wiener, and Torsten Carleman, positioning him as a modernizer of classical Fourier analysis.
War and Exile
Mandelbrojt served France during the Nazi invasion in 1939. By 1940, he relocated to the United States to join the faculty at Rice University. During the later stages of the war, he supported the Free French Forces in London as a member of their scientific committee. Following the liberation, he returned to his position at the Collège de France, where he remained active for several decades until his retirement.
Recognition and Death
His contributions to the field were recognized through numerous accolades, including the Bordin Prize in 1933 and the Émile Picard Medal in 1965. He was named a Knight of the Legion of Honour in 1948, later becoming an Officer in 1964. Upon his retirement in 1972, he was elected to the French Academy of Sciences. He died in 1983 in the 14th arrondissement of Paris and is buried at the Neuilly-sur-Seine New Communal Cemetery.
Fast facts
- Born: 1899, Warsaw
- Died: 1983, 14th arrondissement of Paris
- Citizenship: Poland, France
- Key Employer: Collège de France (1938-1972)
- Doctoral Advisor: Jacques Hadamard
- Academic Focus: Complex and harmonic analysis
- Award: Émile Picard Medal (1965)
- Notable Membership: French Academy of Sciences
Questions readers ask
Was Szolem Mandelbrojt a member of the Bourbaki group?
Yes, he was a co-founder of the group in 1934 and remained a member until the outbreak of World War II.
Did he have any famous relatives?
He was the uncle of Benoit Mandelbrot, who later discovered the Mandelbrot set.
Achievements
- Officer of the Legion of Honour — 1964
- Knight of the Legion of Honour — 1948
- Affiliated with Rice University, Collège de France and University of Lille
- Educated at Paris-Sorbonne University - Paris IV, National University of Kharkiv and École Normale Supérieure
- Worked as mathematician, professor and university teacher
