John N. Mather (original) (raw)

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جون ماثر (بالإنجليزية: John N. Mather)‏ (و. 1942 – 2017 م) هو رياضياتي، وأستاذ جامعي أمريكي، ولد في لوس أنجلوس، كان عضوًا في الأكاديمية الوطنية للعلوم، توفي في برينستون، عن عمر يناهز 75 عاماً. (ar)
John Norman Mather (* 9. Juni 1942 in Los Angeles, Kalifornien; † 28. Januar 2017 in Princeton, New Jersey) war ein US-amerikanischer Mathematiker, der sich mit Differentialtopologie beschäftigte, speziell der Singularitätentheorie („Katastrophentheorie“). (de)
John Norman Mather (June 9, 1942 – January 28, 2017) was a mathematician at Princeton University known for his work on singularity theory and Hamiltonian dynamics. He was descended from Atherton Mather (1663–1734), a cousin of Cotton Mather. His early work dealt with the stability of smooth mappings between smooth manifolds of dimensions n (for the source manifold N) and p (for the target manifold P). He determined the precise dimensions (n,p) for which smooth mappings are stable with respect to smooth equivalence by diffeomorphisms of the source and target (i.e., infinitely differentiable coordinate changes). Mather also proved the conjecture of the French topologist René Thom that under topological equivalence smooth mappings are generically stable: the subset of the space of smooth mappings between two smooth manifolds consisting of the topologically stable mappings is a dense subset in the smooth Whitney topology. His notes on the topic of topological stability are still a standard reference on the topic of topologically stratified spaces. In the 1970s, Mather switched to the field of dynamical systems. He made the following main contributions to dynamical systems that deeply influenced the field. 1. He introduced the concept of and gave a characterization of Anosov diffeomorphisms. 2. Jointly with Richard McGehee, he gave an example of collinear four-body problem which has initial conditions leading to solutions that blow up in finite time. This was the first result that made the Painlevé conjecture plausible. 3. He developed a variational theory for the globally action minimizing orbits for twist maps (convex Hamiltonian systems of two degrees of freedom), along the line of the work of George David Birkhoff, Marston Morse, Gustav A. Hedlund, et al. This theory is now known as . 4. He developed the Aubry–Mather theory in higher dimensions, a theory which is now called . This theory turned out to be deeply related to the viscosity solution theory of Michael G. Crandall, Pierre-Louis Lions et al. for Hamilton–Jacobi equation. The link was revealed in the of Albert Fathi. 5. He announced a proof of Arnold diffusion for nearly integrable Hamiltonian systems with three degrees of freedom. He prepared the technique, formulated a proper concept of genericity and made some important progresses towards its solution. 6. In a series of papers, he proved that for certain regularity r, depending on the dimension of the smooth manifold M, the group Diff(M, r) is perfect, i.e. equal to its own commutator subgroup, where Diff(M, r) is the group of C^r diffeomorphisms of a smooth manifold M that are isotopic to the identity through a compactly supported C^r isotopy. He also constructed counterexamples where the regularity-dimension condition is violated. Mather was one of the three editors of the Annals of Mathematics Studies series published by Princeton University Press. He was a member of the National Academy of Sciences beginning in 1988. He received the John J. Carty Award of the National Academy of Sciences in 1978 (for pure mathematics) and the George David Birkhoff Prize in applied mathematics in 2003. He also received the Brazilian Order of Scientific Merit in 2000 and the Brouwer Medal from the Royal Dutch Mathematical Society in 2014. (en)
John Norman Mather (9 juin 1942 - 28 janvier 2017) est un mathématicien de l'Université de Princeton connu pour ses travaux sur la théorie de la singularité et la dynamique hamiltonienne. (fr)
John Norman Mather (Los Angeles, 9 de junho de 1942 – Princeton, 28 de janeiro de 2017) foi um matemático estadunidense conhecido por seu trabalho em teoria das singularidades e mecânica hamiltoniana. Foi palestrante convidado do Congresso Internacional de Matemáticos em Vancouver (1974: Foliations and local homology groups of diffeomorphisms) e em Berkeley (1986: Dynamics of area preserving mappings). (pt)
Джон Норман Ма́зер (англ. John Norman Mather; 9 июня 1942, Лос-Анджелес, США — 28 января 2017, Принстон, Нью-Джерси, США) — американский математик, специалист в области теории особенностей гладких отображений и теории динамических систем (в частности, гамильтоновой механике). (ru)

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Mather at Oberwolfach in 2005 (en)

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جون ماثر (بالإنجليزية: John N. Mather)‏ (و. 1942 – 2017 م) هو رياضياتي، وأستاذ جامعي أمريكي، ولد في لوس أنجلوس، كان عضوًا في الأكاديمية الوطنية للعلوم، توفي في برينستون، عن عمر يناهز 75 عاماً. (ar)
John Norman Mather (* 9. Juni 1942 in Los Angeles, Kalifornien; † 28. Januar 2017 in Princeton, New Jersey) war ein US-amerikanischer Mathematiker, der sich mit Differentialtopologie beschäftigte, speziell der Singularitätentheorie („Katastrophentheorie“). (de)
John Norman Mather (9 juin 1942 - 28 janvier 2017) est un mathématicien de l'Université de Princeton connu pour ses travaux sur la théorie de la singularité et la dynamique hamiltonienne. (fr)
John Norman Mather (Los Angeles, 9 de junho de 1942 – Princeton, 28 de janeiro de 2017) foi um matemático estadunidense conhecido por seu trabalho em teoria das singularidades e mecânica hamiltoniana. Foi palestrante convidado do Congresso Internacional de Matemáticos em Vancouver (1974: Foliations and local homology groups of diffeomorphisms) e em Berkeley (1986: Dynamics of area preserving mappings). (pt)
Джон Норман Ма́зер (англ. John Norman Mather; 9 июня 1942, Лос-Анджелес, США — 28 января 2017, Принстон, Нью-Джерси, США) — американский математик, специалист в области теории особенностей гладких отображений и теории динамических систем (в частности, гамильтоновой механике). (ru)
John Norman Mather (June 9, 1942 – January 28, 2017) was a mathematician at Princeton University known for his work on singularity theory and Hamiltonian dynamics. He was descended from Atherton Mather (1663–1734), a cousin of Cotton Mather. His early work dealt with the stability of smooth mappings between smooth manifolds of dimensions n (for the source manifold N) and p (for the target manifold P). He determined the precise dimensions (n,p) for which smooth mappings are stable with respect to smooth equivalence by diffeomorphisms of the source and target (i.e., infinitely differentiable coordinate changes). (en)

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جون ماثر (رياضياتي) (ar)
John Mather (Mathematiker) (de)
John N. Mather (fr)
John N. Mather (en)
John Mather (matemático) (pt)
Мазер, Джон Норман (ru)

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