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{{short description|French mathematician (1878–1973)}}
{{Infobox_Scientist
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| name = Maurice René Fréchet
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| caption = Maurice René Fréchet | name = Maurice Fréchet
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| caption = Maurice Fréchet
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| birth_date = {{Birth date|1878|9|2|df=y}}
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| death_place = ], ] | birth_place = ], France
| death_date = {{Death date and age|1973|6|4|1878|9|2|df=y}}
| nationality = ] ]
| death_place = Paris, France
| field = ]
| nationality = French
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'''René Maurice Fréchet''' ({{IPA|fr|ʁəne mɔʁis fʁeʃɛ, moʁ-|lang}}; 2 September 1878 – 4 June 1973) was a French mathematician. He made major contributions to ] and was the first to define ]s. He also made several important contributions to the field of ] and ], as well as ]. His dissertation opened the entire field of ]s on ] and introduced the notion of ]. Independently of ], he discovered the ] in the space of ]. He is often referred to as the founder of the theory of abstract spaces.<ref>{{cite encyclopedia |title=Maurice Fréchet |url=https://www.britannica.com/biography/Maurice-Frechet |encyclopedia=Encyclopædia Britannica|date=31 May 2023 }}</ref>

'''Maurice Fréchet''' (], ] – ], ]) was a ] ]. He made major contributions to the ] of point sets and introduced the entire concept of ]. He also made several important contributions to the field of ] and ], as well as ]. His dissertation opened the entire field ] on ] and introduced the notion of ]. Independently of ], he discovered the representation theorem in the space of ] square integrable ].


==Biography== ==Biography==

===Early life=== ===Early life===
He was born to a ] family in ] to Jacques and Zoé Fréchet. At the time of his birth, his father was a director of a Protestant orphanage in Maligny and was later in his youth appointed a head of a Protestant school. However, the newly established ] was not sympathetic to the religious education and so the laws were enacted requiring all education to be ]. As a result, his father lost his job. To generate some income his mother set up a boarding house for foreigners in ]. His father was able later to obtain another teaching position within the secular system - it was not a job of a headship, however, and the family could not expect as high standards as they might have otherwise. He was born to a ] family in ] to Jacques and Zoé Fréchet. At the time of his birth, his father was a director of a Protestant orphanage in Maligny and was later in his youth appointed a head of a Protestant school. However, the newly established ] was not sympathetic to religious education and so laws were enacted requiring all education to be secular. As a result, his father lost his job. To generate some income his mother set up a boarding house for foreigners in Paris. His father was able later to obtain another teaching position within the secular system – it was not a job of a headship, however, and the family could not expect as high standards as they might have otherwise.


Maurice attended the secondary school ] in Paris where he was taught mathematics by ]. Hadamard recongised the potential of young Maurice and decided to tutor him on an individual basis. After Hadamard moved to the ] in 1894, Hadamard continuously wrote to Fréchet, setting him mathematical problems and harshly critisicing his errors. Much later Fréchet admitted that the problems caused him to live in a continual fear of not being able to solve some of them, even though he was very grateful for the special relationship with Hadamard he was priviliged to enjoy. Maurice attended the secondary school ] in Paris where he was taught mathematics by ]. Hadamard recognised the potential of young Maurice and decided to tutor him on an individual basis. After Hadamard moved to the ] in 1894, Hadamard continuously wrote to Fréchet, setting him mathematical problems and harshly criticising his errors. Much later Fréchet admitted that the problems caused him to live in a continual fear of not being able to solve some of them, even though he was very grateful for the special relationship with Hadamard he was privileged to enjoy.


After completing high-school Fréchet was required to enroll in the military service. This is the time when he was deciding whether to study mathematics or physics - he chose mathematics out of dislike of chemistry classes he would have had to take otherwise. Thus in 1900 he enrolled to ] to study mathematics. After completing high-school Fréchet was required to enroll in military service. This is the time when he was deciding whether to study mathematics or physics – he chose mathematics out of dislike of the chemistry classes he would have had to take otherwise. Thus in 1900 he enrolled to ] to study mathematics.


He started publishing quite early, having published four papers in 1903. He also published some of his early papers in the ] due to his contact with American mathematicians in Paris - particularly ]. He started publishing quite early, having published four papers in 1903. He also published some of his early papers with the ] due to his contact with American mathematicians in Paris—particularly ].


===Middle life=== ===Middle life===
Fréchet served at many different institutions during his academic career. From 1907-1908 he served as a professor of mathematics at the the Lycée in Besançon, then moved in 1908 to the the Lycée in Nantes to stay there for a year. After that he served at the University of Poitiers between 1910-1919. Fréchet served at many different institutions during his academic career. From 1907 to 1908 he served as a professor of mathematics at the Lycée in ], then moved in 1908 to the Lycée in ] to stay there for a year. After that he served at the ] between 1910 and 1919.


He married in 1908 to Suzanne Carive and had four children: Hélène, Henri, Denise and Alain. He married in 1908 to Suzanne Carrive (1881–1945) and had four children: Hélène, Henri, Denise and Alain.


===First World War=== ===First World War===
Fréchet was planning to spend a year in the USA at the University of Illionois but his plan was disrupted when the ] broke out in 1914. He was mobilised on 4<sup>th</sup> August the same year. Because of his diverse language skills, gained when his mother ran the establishment for foreigners, he served as an interpreter for the British Army. However, this was not a safe job and he spent two and a half years very near or at the front. The French egalitarian ideas meant that very many academics were mobilised to serve in the trenches and many of them were lost during the war. It is remarkable that during his service in the war he still managed to produce frequent cutting edge mathematical papers, even with very little time available to devote to mathematics. Fréchet was planning to spend a year in the United States at the ], but his plan was disrupted when the ] broke out in 1914. He was mobilised on 4 August the same year. Because of his diverse language skills, gained when his mother ran the establishment for foreigners, he served as an interpreter for the ]. However, this was not a safe job; he spent two and a half years very near to or at the front. French egalitarian ideals caused many academics to be mobilised. They served in the trenches and many of them were lost during the war. It is remarkable that during his service in the war, he still managed to produce cutting edge mathematical papers frequently, despite having little time to devote to mathematics.


===After the war=== ===After the war===
After the end of the war, Fréchet was chosen to go to Strasbourg to help with the reestablishment of the university. He served as a professor of higher analysis and Director of the Mathematics Institute. Despite being burdened with administrative work, he was again able to produce a large amount of high quality research. After the end of the war, Fréchet was chosen to go to ] to help with the reestablishment of the ]. He served as a professor of higher analysis and Director of the Mathematics Institute. Despite being burdened with administrative work, he was again able to produce a large amount of high-quality research.


In 1928 Fréchet decided to move back to Paris, thanks to encouragement from ], who was then chair in the Calculus of Probabilities and Mathematical Physics at the ]. Fréchet briefly held a position of lecturer at the Sorbonne's ] and from 1928 was a Professor (without a chair). Fréchet was promoted to ] Chair of General Mathematics in 1933 and to Chair of Differential and Integral Calculus in 1935. In 1941 Fréchet succeeded Borel as chair in the Calculus of Probabilities and Mathematical Physics, a position Fréchet held until he retired in 1949. From 1928 to 1935 Fréchet was also put in charge of lectures<!-- not clear exactly what this means, but it's what the source says--> at the ]; in this latter capacity Fréchet was able to direct a significant number of young mathematicians toward research in probability, including ], ], ], and Jean Ville.<ref name="HeydeSeneta2001">{{cite book|editor1-link=Chris Heyde |editor=C.C. Heyde |editor2-link=Eugene Seneta |editor2=E. Seneta|title=Statisticians of the Centuries|url=https://books.google.com/books?id=6DD1FKq6fFoC&pg=PA332|year=2001|publisher=Springer|isbn=978-0-387-95329-8|page=332}}</ref>
In 1928 Fréchet decided, being encouraged by ], to move back to to Paris. He held various positions in Paris until his retirement in 1948. Despite his major achievements, he was not overly appreciated in France. As an illustration, while being nominated numerous times, was not elected a member of the ] until the age of 78.

Despite his major achievements, Fréchet was not overly appreciated in France. As an illustration, while being nominated numerous times, he was not elected a member of the ] until the age of 78.{{citation needed|date=August 2014}} In 1929 he became foreign member of the ] and in 1950 foreign member of the ].<ref>{{cite web|url=http://www.dwc.knaw.nl/biografie/pmknaw/?pagetype=authorDetail&aId=PE00000286 |title=M.R. Fréchet (1878 - 1973) |publisher=Royal Netherlands Academy of Arts and Sciences |access-date=19 July 2015}}</ref>

Fréchet was an ], publishing some papers and articles in that constructed language.<ref></ref> He also served as president of the ''Internacia Scienca Asocio Esperantista'' ("International Scientific Esperantist Association") from 1950 to 1953.<ref>]</ref>


==Main works== ==Main works==
His first major work was his outstanding PhD thesis that he submitted in 1906. The thesis was titled ''Sur quelques points du calcul fonctionnel'' and was concerned with the calculus of functionals. Here Fréchet introduced the concept of a ], although the name is due to ]. The level of abstraction used by Fréchet is similar to that in ], allowing one to develop an axiomatic system to study a large array of mathematical object. The system can then be applied in very many particular cases. His first major work was his outstanding 1906 PhD thesis ''Sur quelques points du calcul fonctionnel'', on the calculus of functionals. Here Fréchet introduced the concept of a ], although the name is due to ]. Fréchet's level of abstraction is similar to that in ], proving theorems within a carefully chosen axiomatic system that can then be applied to a large array of particular cases.


Here is a list of his most important works, in chronological order:<br /> Here is a list of his most important works, in chronological order:
* ''Sur les opérations linéaires I-III, 1904–1907 (On linear operators)
* Les Espaces abstraits, 1928 (Abstract spaces)<br />
* ''Les Espaces abstraits'', 1928 (Abstract spaces)
* Récherches théoriques modernes sur la théorie des probabilités, 1937-1938 (Modern theoretical research in the theory of probability)<br />
* ''Recherches théoriques modernes sur la théorie des probabilités'', 1937–1938 (Modern theoretical research in the theory of probability)
* Les Probabilités associées à un système d'évenements compatibles et dependants, 1939-1943 (The Probabilities Associated with a System of Compatible and Dependent Events)<br />
* ''Les Probabilités associées à un système d'événements compatibles et dépendants'', 1939–1943 (Probabilities Associated with a System of Compatible and Dependent Events)<ref>{{cite journal|author=Kaplansky, Irving|author-link=Irving Kaplansky|title=''Les Probablitités Associées à un Système d'Événements Compatibles et Dépendants; I. Événements en Nombre Fini Fixe'' by Maurice Fréchet|journal=Bull. Amer. Math. Soc.|year=1941|volume=47|issue=1|pages=23–24|url=https://www.ams.org/journals/bull/1941-47-01/S0002-9904-1941-07371-4/S0002-9904-1941-07371-4.pdf|doi=10.1090/s0002-9904-1941-07371-4|doi-access=free}}</ref>
* Pages choisies d'analyse générale 1953 (Selected Pages of General Analysis)<br />
* ''Pages choisies d'analyse générale'', 1953 (Selected Pages of General Analysis)
* Les Mathématiques et le concret 1955 (Mathematics and the concrete)
* ''Les Mathématiques et le concret'', 1955 (Mathematics and the concrete)


Fréchet also developed<ref>{{Cite journal |first=Maurice R. |last=Fréchet |year=1941 |title=Sur la loi de répartition de certaines grandeurs géographiques |language=fr|journal=Journal de la Société de Statistiques de Paris |volume=82 |pages=114–122 }}</ref> ideas from the article ''Deux types fondamentaux de distribution statistique''<ref>Jaromír Korčák (1938): Deux types fondamentaux de distribution statistique. Prague, Comité d’organisation, Bull. de l'Institut International de Statistique, vol. 3, pp. 295–299.</ref> (1938; an English translation ''The Two Fundamental Types of Statistical Distribution'') of Czech ], ] and statistician ].
==See also==

* ]
Fréchet is sometimes credited with the introduction of what is now known as the ], but Fréchet's 1940s lecture notes on the topic appear to have been lost.<ref name="NielsenBhatia2012">{{cite book|author1=Frank Nielsen|author2=Rajendra Bhatia|title=Matrix Information Geometry|url=https://books.google.com/books?id=MAhygTspBU8C&pg=PA248|year=2012|publisher=Springer Science & Business Media|isbn=978-3-642-30232-9|page=248}}</ref>
* ]

==Family==

In 1908 he married Suzanne Carrive.<ref>{{cite book|title=Biographical Index of Former Fellows of the Royal Society of Edinburgh 1783–2002|date=July 2006|publisher=The Royal Society of Edinburgh|isbn=0-902-198-84-X|url=https://www.royalsoced.org.uk/cms/files/fellows/biographical_index/fells_indexp1.pdf|access-date=13 June 2016|archive-date=24 January 2013|archive-url=https://web.archive.org/web/20130124115814/http://www.royalsoced.org.uk/cms/files/fellows/biographical_index/fells_indexp1.pdf|url-status=dead}}</ref>

== See also ==
* ]
* ]
* ] * ]
* ]
* ] * ]
* ] * ]
* ] * ]
* ]
* ]
* ]
* ]
* ] * ]
* ]

==Notes==
{{Reflist}}


==References== ==External links==
*{{Commons category-inline}}
* {{Gutenberg author | id=36278| name=Maurice Fréchet}}
* {{Internet Archive author |sname=Maurice René Fréchet}}
* {{MacTutor Biography|id=Frechet}} * {{MacTutor Biography|id=Frechet}}
* {{MathGenealogy |id=17947}} * {{MathGenealogy |id=17947}}


{{Authority control}}
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{{DEFAULTSORT:Frechet, Rene Maurice}}
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] <!-- Published some papers in Esperanto; see: http://archive.numdam.org/ARCHIVE/CM/CM_1954-1956__12_/CM_1954-1956__12__81_0/CM_1954-1956__12__81_0.pdf -->

Latest revision as of 07:30, 21 August 2024

French mathematician (1878–1973)

Maurice Fréchet
Maurice Fréchet
Born(1878-09-02)2 September 1878
Maligny, France
Died4 June 1973(1973-06-04) (aged 94)
Paris, France
NationalityFrench
Alma materÉcole Normale Supérieure
Known forMetric spaces, Fréchet spaces, Fréchet distribution, Fréchet distance
Scientific career
FieldsMathematics
InstitutionsUniversity of Bordeaux
University of Strasbourg
École des Hautes-Études
École Normale Supérieure
Doctoral advisorJacques Hadamard
Doctoral studentsNachman Aronszajn
Robert Fortet
Đuro Kurepa
Ky Fan
Antonio Monteiro

René Maurice Fréchet (French: [ʁəne mɔʁis fʁeʃɛ, moʁ-]; 2 September 1878 – 4 June 1973) was a French mathematician. He made major contributions to general topology and was the first to define metric spaces. He also made several important contributions to the field of statistics and probability, as well as calculus. His dissertation opened the entire field of functionals on metric spaces and introduced the notion of compactness. Independently of Riesz, he discovered the representation theorem in the space of Lebesgue square integrable functions. He is often referred to as the founder of the theory of abstract spaces.

Biography

Early life

He was born to a Protestant family in Maligny to Jacques and Zoé Fréchet. At the time of his birth, his father was a director of a Protestant orphanage in Maligny and was later in his youth appointed a head of a Protestant school. However, the newly established Third Republic was not sympathetic to religious education and so laws were enacted requiring all education to be secular. As a result, his father lost his job. To generate some income his mother set up a boarding house for foreigners in Paris. His father was able later to obtain another teaching position within the secular system – it was not a job of a headship, however, and the family could not expect as high standards as they might have otherwise.

Maurice attended the secondary school Lycée Buffon in Paris where he was taught mathematics by Jacques Hadamard. Hadamard recognised the potential of young Maurice and decided to tutor him on an individual basis. After Hadamard moved to the University of Bordeaux in 1894, Hadamard continuously wrote to Fréchet, setting him mathematical problems and harshly criticising his errors. Much later Fréchet admitted that the problems caused him to live in a continual fear of not being able to solve some of them, even though he was very grateful for the special relationship with Hadamard he was privileged to enjoy.

After completing high-school Fréchet was required to enroll in military service. This is the time when he was deciding whether to study mathematics or physics – he chose mathematics out of dislike of the chemistry classes he would have had to take otherwise. Thus in 1900 he enrolled to École Normale Supérieure to study mathematics.

He started publishing quite early, having published four papers in 1903. He also published some of his early papers with the American Mathematical Society due to his contact with American mathematicians in Paris—particularly Edwin Wilson.

Middle life

Fréchet served at many different institutions during his academic career. From 1907 to 1908 he served as a professor of mathematics at the Lycée in Besançon, then moved in 1908 to the Lycée in Nantes to stay there for a year. After that he served at the University of Poitiers between 1910 and 1919.

He married in 1908 to Suzanne Carrive (1881–1945) and had four children: Hélène, Henri, Denise and Alain.

First World War

Fréchet was planning to spend a year in the United States at the University of Illinois, but his plan was disrupted when the First World War broke out in 1914. He was mobilised on 4 August the same year. Because of his diverse language skills, gained when his mother ran the establishment for foreigners, he served as an interpreter for the British Army. However, this was not a safe job; he spent two and a half years very near to or at the front. French egalitarian ideals caused many academics to be mobilised. They served in the trenches and many of them were lost during the war. It is remarkable that during his service in the war, he still managed to produce cutting edge mathematical papers frequently, despite having little time to devote to mathematics.

After the war

After the end of the war, Fréchet was chosen to go to Strasbourg to help with the reestablishment of the university. He served as a professor of higher analysis and Director of the Mathematics Institute. Despite being burdened with administrative work, he was again able to produce a large amount of high-quality research.

In 1928 Fréchet decided to move back to Paris, thanks to encouragement from Borel, who was then chair in the Calculus of Probabilities and Mathematical Physics at the Sorbonne. Fréchet briefly held a position of lecturer at the Sorbonne's Rockefeller Foundation and from 1928 was a Professor (without a chair). Fréchet was promoted to tenured Chair of General Mathematics in 1933 and to Chair of Differential and Integral Calculus in 1935. In 1941 Fréchet succeeded Borel as chair in the Calculus of Probabilities and Mathematical Physics, a position Fréchet held until he retired in 1949. From 1928 to 1935 Fréchet was also put in charge of lectures at the École Normale Supérieure; in this latter capacity Fréchet was able to direct a significant number of young mathematicians toward research in probability, including Doeblin, Fortet, Loève, and Jean Ville.

Despite his major achievements, Fréchet was not overly appreciated in France. As an illustration, while being nominated numerous times, he was not elected a member of the Académie des sciences until the age of 78. In 1929 he became foreign member of the Polish Academy of Arts and Sciences and in 1950 foreign member of the Royal Netherlands Academy of Arts and Sciences.

Fréchet was an Esperantist, publishing some papers and articles in that constructed language. He also served as president of the Internacia Scienca Asocio Esperantista ("International Scientific Esperantist Association") from 1950 to 1953.

Main works

His first major work was his outstanding 1906 PhD thesis Sur quelques points du calcul fonctionnel, on the calculus of functionals. Here Fréchet introduced the concept of a metric space, although the name is due to Hausdorff. Fréchet's level of abstraction is similar to that in group theory, proving theorems within a carefully chosen axiomatic system that can then be applied to a large array of particular cases.

Here is a list of his most important works, in chronological order:

  • Sur les opérations linéaires I-III, 1904–1907 (On linear operators)
  • Les Espaces abstraits, 1928 (Abstract spaces)
  • Recherches théoriques modernes sur la théorie des probabilités, 1937–1938 (Modern theoretical research in the theory of probability)
  • Les Probabilités associées à un système d'événements compatibles et dépendants, 1939–1943 (Probabilities Associated with a System of Compatible and Dependent Events)
  • Pages choisies d'analyse générale, 1953 (Selected Pages of General Analysis)
  • Les Mathématiques et le concret, 1955 (Mathematics and the concrete)

Fréchet also developed ideas from the article Deux types fondamentaux de distribution statistique (1938; an English translation The Two Fundamental Types of Statistical Distribution) of Czech geographer, demographer and statistician Jaromír Korčák.

Fréchet is sometimes credited with the introduction of what is now known as the Cramér–Rao bound, but Fréchet's 1940s lecture notes on the topic appear to have been lost.

Family

In 1908 he married Suzanne Carrive.

See also

Notes

  1. "Maurice Fréchet". Encyclopædia Britannica. 31 May 2023.
  2. C.C. Heyde; E. Seneta, eds. (2001). Statisticians of the Centuries. Springer. p. 332. ISBN 978-0-387-95329-8.
  3. "M.R. Fréchet (1878 - 1973)". Royal Netherlands Academy of Arts and Sciences. Retrieved 19 July 2015.
  4. La kanonaj formoj de la 2, 3, 4-dimensiaj paraanalitikaj funkcioj (in Esperanto)
  5. from the Esperanto Misplaced Pages
  6. Kaplansky, Irving (1941). "Les Probablitités Associées à un Système d'Événements Compatibles et Dépendants; I. Événements en Nombre Fini Fixe by Maurice Fréchet" (PDF). Bull. Amer. Math. Soc. 47 (1): 23–24. doi:10.1090/s0002-9904-1941-07371-4.
  7. Fréchet, Maurice R. (1941). "Sur la loi de répartition de certaines grandeurs géographiques". Journal de la Société de Statistiques de Paris (in French). 82: 114–122.
  8. Jaromír Korčák (1938): Deux types fondamentaux de distribution statistique. Prague, Comité d’organisation, Bull. de l'Institut International de Statistique, vol. 3, pp. 295–299.
  9. Frank Nielsen; Rajendra Bhatia (2012). Matrix Information Geometry. Springer Science & Business Media. p. 248. ISBN 978-3-642-30232-9.
  10. Biographical Index of Former Fellows of the Royal Society of Edinburgh 1783–2002 (PDF). The Royal Society of Edinburgh. July 2006. ISBN 0-902-198-84-X. Archived from the original (PDF) on 24 January 2013. Retrieved 13 June 2016.

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