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We value your input. Share your review so everyone else can enjoy it too. Your review was sent successfully and is now waiting for our team to publish it. Elie Cartan, who inspired him throughout his life. It is not a coincidence that this centenary was also celebrated in Grenoble the same year.

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Our generation and previous one have forgotten or misunderstood the depth of the work of Jean-Louis Koszul and Elie Cartan on the study of bounded homogeneous domains. It is our responsibility to correct this omission, and to make it the new inspiration for the Geometric Science of Information. The Cosserat brothers, following a suggestion by Duhem , developed a theory for continuous oriented bodies that consist not just of particles or material points , but also of directions associated with each particle.

Even before the award of his doctorate in , Cosserat had begun teaching mathematics courses at the Faculty of Science at Toulouse. In he became professor of differential and integral calculus there, replacing Thomas Stieltjes who had died on 31 December , and, from that time on, he divided his work between the Faculty of Science and the Observatory. In Cosserat was appointed to the chair of astronomy at Toulouse, becoming director of the Observatory there for the rest of his life. The role of director of the Observatory was a demanding one, and Cosserat became almost totally occupied with administrative tasks from the time of his appointment and so was forced to essentially give up mathematical research from this time on.

Four years later, he was elected to the Bureau de Longitude. Because he was in Toulouse rather than Paris, he was made a non-resident member of both these organisations. In mathematics, we have already noted his early work on geometry. In his later work, Cosserat studied the deformation of surfaces which led him to a theory of elasticity. This first work studied broad questions relating to the foundations of mechanics but later their work turned towards the physical theory. By the early s, Cosserat had stopped working on the type of geometrical problems that had interested him at the start of his career and all his research efforts were directed towards working on mechanics with his brother.

The introduction of this note is peculiarly fortunate for it is high time that kinematics should comprehend the study of deformation and of deformable spaces. The authors have included in their extract certain generalities on curvilinear coordinates, the deformation of a continuous medium in general, infinitely small deformation, use of the mobile trieder, and the case where the non-deformed medium is referred to any curvilinear coordinates. Jacques Levy describes the two Cosserats' contributions to this area [ 1 ] The most practical results concerning elasticity were the introduction of the systematic use of the movable trihedral and the proposal and resolution, before Fredholm 's studies, of the functional equations of the sphere and ellipsoid.

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Cosserat's theoretical research, designed to include everything in theoretical physics that is directly subject to the laws of mechanics, was founded on the notion of Euclidean action [least action] combined with Lagrange 's ideas on the principle of extremality and Lie 's ideas on invariance in regard to displacement groups. The bearing of this original and coherent conception was diminished in importance because at the time it was proposed, fundamental ideas were already being called into question by both the theory of relativity and progress in physical theory.

Thus, in addition to the field of position vectors of a continuum in a given configuration, one also admits vector fields The Cosserats themselves recognised the value of oriented two-dimensional continua i. This journal began publication in and, two years later, Cosserat joined the editorial board. The two other mathematicians who served on this board at this time were Henri Andoyer and Thomas Jan Stieltjes.

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In Cosserat became secretary to the editorial board of the Annals and he continued to hold this role until The funeral took place on 2 June, on a morning with gentle sun; a long procession descended from the Observatory along the slopes which, although close to the city, still retained some greenery. It seemed that Nature had staged a scene both bright and calm Cosserat, E. Paris: A, Hermann et Fils.


Pierre de Fermat, born August 17, , Beaumont-de-Lomagne, France—died January 12, , Castres , French mathematician who is often called the founder of the modern theory of numbers. Independently of Descartes, Fermat discovered the fundamental principle of analytic geometry. His methods for finding tangents to curves and their maximum and minimum points led him to be regarded as the inventor of the differential calculus.

Through his correspondence with Blaise Pascal he was a co-founder of the theory of probability. He was of Basque origin and received his primary education in a local Franciscan school. He studied law, probably at Toulouse and perhaps also at Bordeaux. By he had begun a reconstruction of the long-lost Plane Loci of Apollonius, the Greek geometer of the 3rd century bce. He soon found that the study of loci, or sets of points with certain characteristics, could be facilitated by the application of algebra to geometry through a coordinate system.

Meanwhile, Descartes had observed the same basic principle of analytic geometry, that equations in two variable quantities define plane curves. He served in the local parliament at Toulouse, becoming councillor in Sometime before he became known as Pierre de Fermat, though the authority for this designation is uncertain. In he was named to the Criminal Court. GPS : Skip to Main Content Area. Your browser does not support the audio element. Home GSI Chairmen Welcome.

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