BEGIN:VCALENDAR
VERSION:2.0
PRODID:-//132.216.98.100//NONSGML kigkonsult.se iCalcreator 2.20.4//
BEGIN:VEVENT
UID:20251219T105313EST-3133KIaTuF@132.216.98.100
DTSTAMP:20251219T155313Z
DESCRIPTION:Conférence Nirenberg du CRM en analyse géométrique: Birkhoff Co
 njecture for convex planar billiards\n\nWeb site : http://www.crm.math.ca/
 Nirenberg2019/\n\nG.D. Birkhoff introduced a mathematical billiard inside 
 of a convex domain as the motion of a massless particle with elastic refle
 ction at the boundary. A theorem of Poncelet says that the billiard inside
  an ellipse is integrable\, in the sense that the neighborhood of the boun
 dary is foliated by smooth closed curves and each billiard orbit near the 
 boundary is tangent to one and only one such curve (in this particular cas
 e\, a confocal ellipse). A famous conjecture by Birkhoff claims that ellip
 ses are the only domains with this property. We show a local version of th
 is conjecture – namely\, that a small perturbation of an ellipse has this 
 property only if it is itself an ellipse. This is based on several papers 
 with A. Avila\, J. De Simoi\, G. Huang and A. Sorrentino.\n
DTSTART:20190122T200000Z
DTEND:20190122T210000Z
LOCATION:Room 5345\, CA\, Pav. André-Aisenstadt
SUMMARY:Vadim Kaloshin\, University of Maryland
URL:/mathstat/channels/event/vadim-kaloshin-university
 -maryland-293435
END:VEVENT
END:VCALENDAR