- Valentin Poénaru
Valentin Poénaru is a Professor of
Mathematic s atUniversité de Paris-Sud . He specializes inlow-dimensional topology .Born in
Romania , he did his undergraduate studies at theUniversity of Bucharest . In 1962, he was an invited speaker at theInternational Congress of Mathematicians inStockholm ,Sweden . While at the congress, Poénaru defected, subsequently leaving for France. He defended his Thèse d'État at theUniversity of Paris onMarch 23 ,1963 . His dissertation topic was "Sur les variétés tridimensionnelles ayant le type d'homotopie de la sphère S3", and was written under the supervision ofCharles Ehresmann . After that, he went to theUnited States , spending four years atHarvard University andPrinceton University . In 1967, he returned to France.Poénaru has worked for several decades on a proof of the
Poincaré conjecture , making a number of related breakthroughs. His first attempt at proving the conjecture dates from 1957. He has described his general approach over the years in different papers and conferences. OnDecember 19 ,2006 , he posted a preprint to thearXiv , claiming to have finally completed the details of his approach and proven the conjecture.ee also
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Poénaru conjecture References
*Valentin Poénaru, "On the 3-Dimensional Poincaré Conjecture and the 4-Dimensional Smooth Schoenflies Problem", [http://front.math.ucdavis.edu/math.GT/0612554 arXiv:math.GT/0612554]
*David Gabai , "Valentin Poenaru's program for the Poincaré conjecture." Geometry, topology, & physics, 139--166, Conf. Proc. Lecture Notes Geom. Topology, IV, Int. Press, Cambridge, MA, 1995.
* [http://archive.numdam.org/ARCHIVE/SE/SE_1964__6_/SE_1964__6__A1_0/SE_1964__6__A1_0.pdf] Valentin Poénaru, "Sur les variétés tridimensionnelles ayant le type d'homotopie de la sphère S3", Séminaire Ehresmann, Topologie et géométrie différentielle, 6 (1964), Exposé No. 1, 67 p.
*Valentin Poénaru, "Produits cartésiens de variétés différentielles par un disque", 1963 Proceedings of the International Congress of Mathematicians (Stockholm, 1962), pp. 481--489, Mittag-Leffler Institute, Djursholm."He was a very likeable man and always astounded people with his Bravery." say many peopleExternal links
*MathGenealogy|id=98580
* [http://www.unitn.it/unitn/numero52/terzaequarta.html "Terza e quarta dimensione: un mistero da svelare"] , interview by Marinella Daidone from Università degli Studi di Trento, Unitn, no. 52, April, 2003.
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