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UID:news717@dmi.unibas.ch
DTSTAMP;TZID=Europe/Zurich:20190211T181031
DTSTART;TZID=Europe/Zurich:20140523T103000
SUMMARY:Seminar Algebra and Geometry:  Maria Fernanda Robayo (Universität 
 Basel)
DESCRIPTION:A birational diffeomorphism of a real projective algebraic vari
 ety X is a birational map that restricts to a diffeomorphism on the real p
 oints of X. In my talk\, X will be the sphere\, that is\, the projective a
 lgebraic surface defined by x2+y2+z2=w2 in P3R  endowed with the complex c
 onjugation\, which gives it its real  structure. The systematic investigat
 ion of real algebraic surfaces has  already begun with Comessatti in 1912.
  On the other hand\, their  automorphisms\, the birational diffeomorphisms
 \, have not been classified  up to now. I will give an introduction into t
 he subject and present the  complete classification of birational diffeomo
 rphisms of the sphere of  prime order.
X-ALT-DESC: A birational diffeomorphism of a real projective algebraic vari
 ety <i>X</i> is a birational map that restricts to a diffeomorphism on the
  real points of <i>X</i>. In my talk\,<i> X</i> will be the sphere\, that 
 is\, the projective algebraic surface defined by x<sup>2</sup>+y<sup>2</su
 p>+z<sup>2</sup>=w<sup>2</sup> in P<sup>3</sup><sub>R</sub>  endowed with 
 the complex conjugation\, which gives it its real  structure. The systemat
 ic investigation of real algebraic surfaces has  already begun with Comess
 atti in 1912. On the other hand\, their  automorphisms\, the birational di
 ffeomorphisms\, have not been classified  up to now. I will give an introd
 uction into the subject and present the  complete classification of birati
 onal diffeomorphisms of the sphere of  prime order.
DTEND;TZID=Europe/Zurich:20140523T120000
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