About: Claude LeBrun

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Claude R. LeBrun (born 1956) is an American mathematician who holds the position of SUNY Distinguished Professor of Mathematics at Stony Brook University. Much of his research concerns the Riemannian geometry of 4-manifolds, or related topics in complex and differential geometry.

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  • Claude R. LeBrun (* 26. November 1956) ist ein Mathematiker, der sich insbesondere mit vierdimensionalen Mannigfaltigkeiten und speziell Einsteinschen Mannigfaltigkeiten befasst, wobei er sich Techniken der Differentialgeometrie, Differentialtopologie, Komplexer Geometrie, Symplektischer und Algebraischer Geometrie bedient. LeBrun wurde 1980 bei Roger Penrose an der Universität Oxford promoviert (Spaces of complex geodesics and related structures). Er ist Professor an der State University of New York at Stony Brook (SUNY). Nachdem John A. Thorpe und Nigel Hitchin in Form einer nach ihnen benannten Ungleichung zwischen topologischen Invarianten eine notwendige Bedingung für die Existenz von Einstein-Metriken auf vierdimensionalen kompakten glatten Mannigfaltigkeiten angaben, zeigten LeBrun und unabhängig , dass die Bedingung nicht hinreichend ist. Sie zeigten die Existenz unendlich vieler nicht homöomorpher Mannigfaltigkeiten, die die Ungleichung erfüllen, aber keine Einstein-Metrik zulassen. Mit Fabrizio Catanese bewies er für alle die Existenz von glatten kompakten -dimensionalen Mannigfaltigkeiten mit zwei Einsteinmetriken, deren Skalarkrümmungen einander entgegengesetzte Vorzeichen haben, womit sie eine Vermutung von Arthur Besse widerlegten. 1994 war er Invited Speaker auf dem Internationalen Mathematikerkongress in Zürich (Anti Self-Dual Metrics and Kähler-Geometry). Er ist Fellow der American Mathematical Society. (de)
  • Claude R. LeBrun (born 1956) is an American mathematician who holds the position of SUNY Distinguished Professor of Mathematics at Stony Brook University. Much of his research concerns the Riemannian geometry of 4-manifolds, or related topics in complex and differential geometry. LeBrun earned his D.Phil. (Oxford equivalent of a Ph.D.) from the University of Oxford in 1980, under the supervision of Roger Penrose, and in the same year took a faculty position at Stony Brook. Since then, he has also held positions atthe Institut des Hautes Études Scientifiques, the Mathematical Sciences Research Institute, and the Institute for Advanced Study. He is the namesake of the LeBrun manifolds, a family of self-dual manifolds that he discovered in 1989 and that was named after him by Michael Atiyah and Edward Witten. LeBrun is also known for his work on Einstein manifolds and the Yamabe invariant. In particular, he produced examples showing that the converse of the Hitchin–Thorpe inequality does not hold: there exist infinitely many four-dimensional compact smooth simply connected manifolds that obey the inequality but do not admit Einstein metrics. LeBrun was an invited speaker at the 1994 International Congress of Mathematicians. In 2012, he became a Fellow of the American Mathematical Society. In 2016, a conference in his honor was held in Montreal.In 2018, he became a Simons Foundation Fellow in Mathematics. In 2020, he was appointed as Distinguished Professor at the State University of New York. (en)
  • Claude R. LeBrun (26 de novembro de 1956) é um matemático estadunidense. Professor de matemática da , concentra suas pesquisas na geometria riemanniana de 4-variedades, ou tópicos relacionados em geometria complexa e diferencial. LeBrun obteve um doutorado na Universidade de Oxford em 1980, orientado por Roger Penrose., obtendo no mesmo ano um cargo na faculdade de Stony Brook. Desde então trabalhou no Institut des Hautes Études Scientifiques, Mathematical Sciences Research Institute e Instituto de Estudos Avançados de Princeton. LeBrun foi palestrante convidado (Invited Speaker) no Congresso Internacional de Matemáticos de 1994. Em 2012 foi eleito fellow da American Mathematical Society. (pt)
  • Клод Лебрю́н (англ. Claude LeBrun, р. 26 ноября 1956 года в Далласе, штат Техас) — североамериканский геометр, специалист в и дифференциальной геометрии, в первую очередь четырёхмерных многообразий, а также теории относительности. Выдающийся профессор (англ. SUNY Distinguished Professor) Университета штата Нью-Йорк в Стони-Бруке. (ru)
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  • United States (en)
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  • Claude LeBrun (en)
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  • Клод Лебрю́н (англ. Claude LeBrun, р. 26 ноября 1956 года в Далласе, штат Техас) — североамериканский геометр, специалист в и дифференциальной геометрии, в первую очередь четырёхмерных многообразий, а также теории относительности. Выдающийся профессор (англ. SUNY Distinguished Professor) Университета штата Нью-Йорк в Стони-Бруке. (ru)
  • Claude R. LeBrun (born 1956) is an American mathematician who holds the position of SUNY Distinguished Professor of Mathematics at Stony Brook University. Much of his research concerns the Riemannian geometry of 4-manifolds, or related topics in complex and differential geometry. (en)
  • Claude R. LeBrun (* 26. November 1956) ist ein Mathematiker, der sich insbesondere mit vierdimensionalen Mannigfaltigkeiten und speziell Einsteinschen Mannigfaltigkeiten befasst, wobei er sich Techniken der Differentialgeometrie, Differentialtopologie, Komplexer Geometrie, Symplektischer und Algebraischer Geometrie bedient. LeBrun wurde 1980 bei Roger Penrose an der Universität Oxford promoviert (Spaces of complex geodesics and related structures). Er ist Professor an der State University of New York at Stony Brook (SUNY). (de)
  • Claude R. LeBrun (26 de novembro de 1956) é um matemático estadunidense. Professor de matemática da , concentra suas pesquisas na geometria riemanniana de 4-variedades, ou tópicos relacionados em geometria complexa e diferencial. LeBrun obteve um doutorado na Universidade de Oxford em 1980, orientado por Roger Penrose., obtendo no mesmo ano um cargo na faculdade de Stony Brook. Desde então trabalhou no Institut des Hautes Études Scientifiques, Mathematical Sciences Research Institute e Instituto de Estudos Avançados de Princeton. (pt)
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  • Claude LeBrun (en)
  • Claude LeBrun (de)
  • Claude LeBrun (pt)
  • Лебрюн, Клод (ru)
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  • Claude LeBrun (en)
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