Valentin Poénaru

Alexandre Valentin Poenaru ( born 1932 in Bucharest ) is a French- Romanian mathematician who is mainly concerned with low -dimensional ( dimension 3,4 ) topology.

Life and work

Poenaru studied at the University of Bucharest. In 1962 he was invited speaker at the International Congress of Mathematicians in Stockholm (Produits de cartésiens variétés differential par un disque ) and moved on this occasion in the West. He went to France in 1963 and his habilitation at the University of Paris at Charles Ehresmann ( Thèse d' État, Sur les variétés tridimensionnelles ayant le type d' homotopy de la sphère S3). Poenaru then spent four years at Harvard University and Princeton University ( 1964/65 the Institute for Advanced Study) and from 1967 professor at the University of Paris-Sud in Orsay.

Poenaru dealt since 1957 with the Poincare conjecture and continues to pursue its own program to prove the conjecture, as an alternative to the proof of Perelman. His doctoral counts Pierre Vogel.

Writings (selection )

• Produits de cartésiens variétés differential par un disque. 1963 Proc. Boarding. Congr. Mathematicians (Stockholm, 1962), pp. 481-489 Institute Mittag-Leffler, Djursholm
• With André Haefliger: La classification of immersions combinatoires. Inst Hautes Études Sci. Publ Math No. 23 1964 75-91.
• William Boone, Wolfgang hook: On recursively unsolvable problems in topology and Their classification. 1968 Contributions to Mathematical Logic ( Colloquium, Hannover, 1966), pp. 37-74 North -Holland, Amsterdam
• Singularités en présence de symétrie. En particulier en présence de la symétrie d'un groupe de Lie compact. Lecture Notes in Mathematics, Vol 510 Springer -Verlag, Berlin-New York, 1976.
• Albert Fathi, François Laudenbach: Travaux de Thurston sur les surfaces. Séminaire Orsay. With an English summary. Astérisque, 66-67. Société Mathématique de France, Paris, 1979.
• Almost convex groups, Lipschitz combing, and for universal covering spaces of closed 3- manifolds. J. Differential Geom 35 (1992 ), no 1, 103-130.