Moduli and the decomposition group of 6 lines

Géométrie Algébrique

Lieu: 
salle de réunion du bâtiment M2 de 14h00 à 17h00.
Orateur: 
MUKAI SHIGERU
Affiliation: 
KYOTO-Japan
Dates: 
Mardi, 13 Février, 2018 - 15:30 - 16:30
Résumé: 

Abstract: The configuration space of 6 lines in the projective plane P^2 is isomorphic to the double cover of  P^4  with branch the Igusa quartic.  I will discuss the group of Cremona transformations preserving a 6-line arrangemaent in the  triple point free case, relating with this structure of configuration space.