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SUMMARY:All Y-friezes come from SL_2-friezes
DTSTART:20260904T093000Z
DTEND:20260904T103000Z
DTSTAMP:20260910T060900Z
UID:indico-event-17084@indico.math.cnrs.fr
CONTACT:kellendonk@math.univ-lyon1.fr\;athomas@math.univ-lyon1.fr
DESCRIPTION:Speakers: Andrei Zabolotskii (Open Univ.)\n\nY-friezes are "sh
 adows" of Y-cluster variables\, like Conway–Coxeter friezes are "shadows
 " of cluster variables. We resolve a conjecture of de Saint Germain\, show
 ing that all Y-friezes arise from Conway–Coxeter friezes. We give a thre
 efold characterisation of those Conway–Coxeter friezes that give rise to
  the same Y-frieze: an elementary characterisation using quiddities\, a co
 mbinatorial characterisation using triangulated polygons\, and a geometric
 al characterisation using chains of horocycles.\n\nhttps://indico.math.cnr
 s.fr/event/17084/
LOCATION:Salle Fokko du Cloux (Bat. Braconnier)
URL:https://indico.math.cnrs.fr/event/17084/
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