BEGIN:VCALENDAR VERSION:2.0 PRODID:-//132.216.98.100//NONSGML kigkonsult.se iCalcreator 2.20.4// BEGIN:VEVENT UID:20250623T040618EDT-9155OvHl5v@132.216.98.100 DTSTAMP:20250623T080618Z DESCRIPTION:Title: Odd Moebius—Kantor Ring Puzzles\n\nAbstract: Moebius—Kan tor complexes were introduced by Barré and Pichot to serve as a canonical family of spaces of “intermediate rank”\, in an attempt to shed light on t he flat-closing conjecture. They form a rich family of locally-defined CAT (0) spaces with interesting flat geometry\, and can be distinguished up to isomorphism by an invariant called the parity. In this talk\, we give an introduction to Moebius—Kantor complexes and report on a recent work by Ba rré\, Pichot\, and myself classifying the odd ring puzzles associated with them. These are tessellations of the Euclidean plane with local condition s constraining the set of admissible neighbourhoods\, arising as embedded flat planes in our complexes.\n\nWe will gather for teatime in the lounge after the talk. Note that this will be the last talk of the semester.\n\n  \n DTSTART:20250409T200000Z DTEND:20250409T210000Z LOCATION:Room 920\, Burnside Hall\, CA\, QC\, Montreal\, H3A 0B9\, 805 rue Sherbrooke Ouest SUMMARY:Othmane Oukrid (ɬ﷬) URL:/mathstat/channels/event/othmane-oukrid-mcgill-uni versity-364841 END:VEVENT END:VCALENDAR