BEGIN:VCALENDAR
VERSION:2.0
PRODID:-//132.216.98.100//NONSGML kigkonsult.se iCalcreator 2.20.4//
BEGIN:VEVENT
UID:20260521T072010EDT-2011V1uux9@132.216.98.100
DTSTAMP:20260521T112010Z
DESCRIPTION:Title: Order and disorder in tilings and non-tilings\n\nAbstrac
 t: In tiling theory\, many deep questions arise from the subtle ways that 
 the local information encoded in the boundaries of a set of shapes determi
 nes the long-range behaviour of the tilings those shapes admit.  I am part
 icularly interested in three problems in this domain: Heesch's problem\, w
 hich asks how many times a non-tiler may be surrounded by copies of itself
 \; the isohedral number problem\, which asks how many transitivity classes
  a shape may force upon its periodic tilings\; and the (now resolved) eins
 tein problem\, which asks for a single shape that is forced to tile non-pe
 riodically.  I will discuss these problems\, some of the mathematical and 
 computational research that has been done to study them\, and their genera
 lizations to multiple shapes.\n\nVenue: Hybride - PK-5115\, Pavillon Prési
 dent-Kennedy\, UQAM\n
DTSTART:20260522T183000Z
DTEND:20260522T193000Z
SUMMARY:Craig Kaplan (University of Waterloo)
URL:/channels/channels/event/craig-kaplan-university-w
 aterloo-372983
END:VEVENT
END:VCALENDAR