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SUMMARY:Galois theory for nonlinear difference equations - Casale\, G (Ren
 nes 1)
DTSTART:20090511T153000Z
DTEND:20090511T163000Z
UID:TALK18393@talks.cam.ac.uk
CONTACT:Mustapha Amrani
DESCRIPTION:I will present Malgrange's definition of Galois pseudogroup fo
 r a nonlinear difference equation and explaine how it can be used to obtai
 n integrability condition on linearisation of the equation.  In case of a 
 symplectique map one gets the discrete version of Morales-Ramis theorem : 
 If such a map is Liouville integrable then the\ndifference Galois group of
  its linearisation along a (good) particular solution  is almost commutati
 ve.\n
LOCATION:Satellite
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