Szolem Mandelbrojt

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Szolem Mandelbrojt
File:Szolem Mandelbrojt.jpeg
Szolem Mandelbrojt
Born (1899-01-10)10 January 1899
Warsaw, Congress Poland
Died 23 September 1983(1983-09-23) (aged 84)
Paris, France
Residence Poland, France, U.S.
Nationality Polish and French
Fields Mathematician
Institutions Collège de France
Rice University
University of Clermont-Ferrand
University of Lille
Alma mater Paris-Sorbonne University
University of Kharkiv
Doctoral advisor Jacques Hadamard
Doctoral students Paul Malliavin
Shmuel Agmon
Hugh Brunk
Vincent Cowling
John Gergen
Guy Johnson, Jr.
Jean-Pierre Kahane
Yitzhak Katznelson
George Piranian
Hans Jakob Reiter
He was the uncle of Benoit Mandelbrot.

Szolem Mandelbrojt (10 January 1899 – 23 September 1983) was a Polish-born French mathematician specialized in mathematical analysis. He was a Professor at Collège de France from 1938 to 1972, where he held the Chair of Analytical Mechanics and Celestial Mechanics.


Mandelbrojt was born on 10 January 1899 in Warsaw, Poland, in a Jewish family of Lithuanian descent. He was initially educated in Warsaw.

In 1919, he went to Kharkov, Ukraine and spent one year as a student of the Russian mathematician Bernstein.

In 1920, he emigrated to France and settled in Paris. In subsequent years, he attended the seminars of Hadamard, Lebesgue, Picard, and others.

In 1923, he received a doctorate from Paris-Sorbonne University on the theory of analytic continuation of Taylor series. His Ph.D. Advisor was Hadamard.

In 1924, he was awarded a Rockefeller Fellowship and spent almost two years in the United States.

In 1926, he received the French nationality.

In 1926-27, he spent one year as Assistant Professor at Rice Institute (now Rice University) in Houston, Texas.

In 1928, he came back to France and was appointed Assistant Professor at University of Lille.

In 1929, he became Full Professor at University of Clermont-Ferrand.

In December 1934, he co-founded the Bourbaki group. He remained a member until World War II.

In 1936, he helped several members of his family emigrate from Poland to France. One of them, his nephew Benoit Mandelbrot, was to discover the Mandelbrot set and coin the name fractal in the 1970s.

In 1938, he succeeded Hadamard at Collège de France and took up the Chair of Analytical Mechanics and Celestial Mechanics.[1]

In 1939, he fought for France when the country was invaded by the Nazis.

In 1940, as many scientists helped by Louis Rapkine and the Rockefeller Foundation, he relocated to the United States and took up a position at Rice Institute.

In 1944, he joined the scientific committee of the Free French Forces in London, England.

In 1945, he moved back to France and resumed his professional activities at Collège de France, where he remained until his retirement in 1972.

In 1972, he was elected a member of the French Academy of Sciences.

He died in Paris, France on 23 September 1983.


Even though Mandelbrojt was an early member of the Bourbaki group, and he did take part in a number of Bourbaki gatherings until the breakout of the war, his main research interests were actually quite remote from abstract algebra. As evidenced by his publications (see next), he focused on complex analysis and harmonic analysis, with an emphasis on Dirichlet series, lacunary series, and entire functions.

Rather than a Bourbakist, he is perhaps more accurately described as a follower of G. H. Hardy. Together with Norbert Wiener and Torsten Carleman, he can be viewed as a moderate modernizer of classical Fourier analysis.

Shmuel Agmon, Jean-Pierre Kahane, Yitzhak Katznelson, and Paul Malliavin are among his students.

Selected works


  • Hadamard, Jacques; Mandelbrojt, Szolem (1926). La série de Taylor et son prolongement analytique (2nd ed.). Gauthier-Villars. [2]
  • Mandelbrojt, Szolem (1951). "General theorems of closure". Rice Institute Pamphlet (Monograph published as a special issue). XIV (4): 225–352. 
  • Mandelbrojt, Szolem (1958). "Composition Theorems". Rice Institute Pamphlet (Monograph published as a special issue). 45 (3). 
  • Mandelbrojt, Szolem (1967). Fonctions entières et transformées de Fourier. Applications. Mathematical Society of Japan. 
  • Mandelbrojt, Szolem (1972) [1969]. Dirichlet series. Principles and methods [Séries de Dirichlet. Principes et méthodes]. Reidel. 

Lecture notes

  • Mandelbrojt, Szolem (1927). "Modern researches on the singularities of functions defined by Taylor's series; lectures delivered at the Rice Institute during the academic year 1926-27". Rice Institute Pamphlet (12 articles). 14 (4). [3]
  • Mandelbrojt, Szolem (1935). Séries de Fourier et classes quasi-analytiques de fonctions. Leçons professées à l'Institut Henri Poincaré et à la Faculté des sciences de Clermont-Ferrand. Gauthier-Villars. 
  • Mandelbrojt, Szolem (1942). "Analytic Functions and Classes of Infinitely Differentiable Functions. A series of lectures delivered at the Rice Institute during the academic year 1940-41". Rice Institute Pamphlet (17 articles). 29 (1). 
  • Mandelbrojt, Szolem (1944). "Dirichlet series. Lectures delivered at the Rice Institute during the academic year 1942-43". Rice Institute Pamphlet (10 articles). 31 (4). 
  • Mandelbrojt, Szolem (1952). Séries adhérentes. Régularisation des suites. Applications. Leçons professées au Collège de France et au Rice Institute. Gauthier-Villars. [4]


  • Mandelbrojt, Szolem (1936). "Séries lacunaires". Actualités Scientifiques et Industrielles. Hermann. 305 (Exposés sur la théorie des fonctions, no. 2). [5]
  • Mandelbrojt, Szolem (1938). "La régularisation des fonctions". Actualités Scientifiques et Industrielles. Hermann. 733 (Exposés sur la théorie des fonctions, no. 13). 
  • Mandelbrojt, Szolem; MacLane, Gerald R. (1947). "On functions holomorphic in a strip region, and an extension of Watson's problem". Trans. Amer. Math. Soc. 61 (3): 454–467. MR 0020142. doi:10.1090/S0002-9947-1947-0020142-5. 
  • Mandelbrojt, Szolem (1967). "Exponentielle associée à un ensemble; transformées de Fourier généralisées". Ann. Inst. Fourier, Grenoble. 17 (1): 325–351. MR 257360. doi:10.5802/aif.259. 


  • Mandelbrojt, Szolem (1923). Sur les séries de Taylor qui présentent des lacunes (Ph.D. thesis). Paris-Sorbonne University. 


  1. Professeurs disparus at Collège de France.
  2. Smail, L. L. (1928). " 'La Série de Taylor et son Prolongement Analytique' by J. Hadamard and S. Mandelbrojt". Bull. Amer. Math. Soc. (Review). 34 (1): 119–120. doi:10.1090/S0002-9904-1928-04539-1. 
  3. Widder, D. V. (1929). " 'Modern Researches on the Singularities of Functions Defined by Taylor's Series' by S. Mandelbrojt". Bull. Amer. Math. Soc. (Review). 35 (3): 409–410. doi:10.1090/S0002-9904-1929-04762-1. 
  4. Fuchs, W. H. J. (1953). " 'Séries adhérentes. Régularisation des suites. Applications' by S. Mandelbrojt". Bull. Amer. Math. Soc. (Review). 59 (4): 413–414. doi:10.1090/S0002-9904-1953-09743-9. 
  5. Moore, C. N. (1938). " 'La Réduction des Séries Alternées Divergentes et ses Applications' by J. Ser and 'Séries Lacunaires' by S. Mandelbrojt". Bull. Amer. Math. Soc. (Review). 44 (5): 313. doi:10.1090/S0002-9904-1938-06721-3. 


  • Comité national français de mathématiciens (1981). Szolem Mandelbrojt. Selecta. Gauthier-Villars. 

External links