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| '''Maurice Fréchet''' (], ] – ], ]) was a ] ]. His major contribution is the introduction of abstract spaces, where he applied the intuitive Euclidean geometry to form abstract relationships between the elements of the space. Particularly important are his generalisations of the concept of ], ], ] and ] to the abstract setting. This led him to coin the term ]. These new concepts were incredibly successful and are today considered to be the iron repertoire of any good analysis course. The entire field of ] has emerged from Fréchet's ideas. He was a student of ] at ]. | |||
| '''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== | ||
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| ===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. | |||
| 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. | |||
| ==Works== | |||
| His major works are, in chronological order:<br /> | His major works are, in chronological order:<br /> | ||
| - Les Espaces abstraits, 1928 (Abstract spaces)<br /> | - Les Espaces abstraits, 1928 (Abstract spaces)<br /> | ||
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| - Pages choisies d'analyse générale 1953 (Selected Pages of General Analysis)<br /> | - Pages choisies d'analyse générale 1953 (Selected Pages of General Analysis)<br /> | ||
| - Les Mathématiques et le concret 1955 (Mathematics and the concrete) | - Les Mathématiques et le concret 1955 (Mathematics and the concrete) | ||
| The Fréchet metric is a metric function upon an infinite ] of ] <X<sub>1</sub>,d<sub>1</sub>>,<X<sub>2</sub>,d<sub>2</sub>>..., defined by: | |||
| <math>d(x,y)=\sum\frac{1}{2^n}\frac{d_{n}(x_{n},y_{n})}{1+d_{n}(x_{n},y_{n})}</math> | |||
| ==See also== | ==See also== | ||
Revision as of 09:02, 2 March 2007
Maurice Fréchet (September 2, 1878 – June 4, 1973) was a French mathematician. He made major contributions to the topology of point sets and introduced the entire concept of abstract spaces. He also made several important contributions to the field of statistics and probability, as well as calculus. His dissertation opened the entire field 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.
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 the religious education and so the 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 recongised 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 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.
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 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 in 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 1907-1908 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.
He married in 1908 to Suzanne Carive and had four children: Hélène, Henri, Denise and Alain.
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 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 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.
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, being encouraged by Borel, 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 Academy of Sciences until the age of 78.
Works
His major works are, in chronological order:
- Les Espaces abstraits, 1928 (Abstract spaces)
- Récherches 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)
- Pages choisies d'analyse générale 1953 (Selected Pages of General Analysis)
- Les Mathématiques et le concret 1955 (Mathematics and the concrete)
See also
References
- O'Connor, John J.; Robertson, Edmund F., "René Maurice Fréchet", MacTutor History of Mathematics Archive, University of St Andrews
- René Maurice Fréchet at the Mathematics Genealogy Project
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