BEGIN:VCALENDAR
VERSION:2.0
PRODID:-//Memento EPFL//
BEGIN:VEVENT
SUMMARY:The poset of posets
DTSTART:20131101T151500
DTSTAMP:20260601T082501Z
UID:1b711002114e316ce68bcbb2778dc4d1614502ea0185c2fc21463605
CATEGORIES:Conferences - Seminars
DESCRIPTION:Serge Bouc [Amiens]\nAbstract : Let X be a finite set. The set
  of order relations on X is naturally partially ordered by inclusion of r
 elations. The resulting poset is called the poset of posets on X. In this
  talk\, I will look at topological and combinatorial properties of this p
 oset\, and show in particular that all its intervals are either contracti
 ble\, or have the homotopy type of a sphere. This leads to a complete det
 ermination of the Möbius function of the poset of posets.
LOCATION:MAA330
STATUS:CONFIRMED
END:VEVENT
END:VCALENDAR