BEGIN:VCALENDAR
VERSION:2.0
PRODID:-//132.216.98.100//NONSGML kigkonsult.se iCalcreator 2.20.4//
BEGIN:VEVENT
UID:20250808T154700EDT-5383idWo6z@132.216.98.100
DTSTAMP:20250808T194700Z
DESCRIPTION:TITLE: Thin right-angled Coxeter subgroups of some arithmetic l
 attices\n\nABSTRACT: Roughly speaking\, a subgroup of a lattice in a semis
 imple Lie group is said to be thin if the subgroup is of infinite index in
  the lattice but is Zariski-dense in the Lie group. Free groups and surfac
 e groups have many manifestations as thin subgroups of lattices in Lie gro
 ups\, by classical work of Tits in the free case\, and by work of Kahn–Mar
 kovic\, Hamenstädt\, Long–Reid\, Kahn–Labourie–Mozes\, and others in the s
 urface group case. We sketch an argument that an irreducible right-angled 
 Coxeter group on n>2 vertices embeds as a thin subgroup of an arithmetic l
 attice in O(p\,q) for some p\,q>0 satisfying p+q=n\, and that we can arran
 ge for the lattice to be cocompact\n
DTSTART:20220216T200000Z
DTEND:20220216T210000Z
SUMMARY:Sami Douba (9IÖÆ×÷³§Ãâ·Ñ)
URL:/mathstat/channels/event/sami-douba-mcgill-univers
 ity-337618
END:VEVENT
END:VCALENDAR