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SUMMARY:Cremona transformations and diffeomorphisms of topological surface
 s
DTSTART:20091112T113000
DTSTAMP:20260405T204759Z
UID:2dd941d37eafe06bd42e030a43d18e17ab7fa3e29bde89636f6835a8
CATEGORIES:Conferences - Seminars
DESCRIPTION:Frederic Mangolte (Université de Savoie)\nCremona transformat
 ions and diffeomorphisms of topological surfaces\n\nRésumé : We show tha
 t the action of Cremona transformations on the real points of quadrics exh
 ibits the full complexity of the diffeomorphisms of the sphere\, the torus
 \, and of all non-orientable surfaces. The main result  says that if X is 
 a surface birational to the real projective plane\, then Aut(X)\, the grou
 p of algebraic automorphisms\, is dense in Diff(X)\, the group of self-dif
 feomorphisms of X. (Joint work with János Kollár.)
LOCATION:MAA110 
STATUS:CONFIRMED
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