BEGIN:VCALENDAR VERSION:2.0 PRODID:-//wp-events-plugin.com//7.2.3.1//EN TZID:Europe/Paris X-WR-TIMEZONE:Europe/Paris BEGIN:VEVENT UID:4780@i2m.univ-amu.fr DTSTART;TZID=Europe/Paris:20230515T150000 DTEND;TZID=Europe/Paris:20230515T160000 DTSTAMP:20240524T072506Z URL:https://www.i2m.univ-amu.fr/evenements/an-aperiodic-monotile/ SUMMARY: (...): An aperiodic monotile DESCRIPTION:: A set of shapes is called aperiodic if the shapes admit tilin gs of the plane\, but none that have translational symmetry. A longstandin g open problem asks whether a set consisting of a single shape could be ap eriodic\; such a shape is known as an aperiodic monotile or sometimes an “einstein”. The recently discovered “hat” monotile settles this pr oblem in two dimensions. In this talk I provide necessary background on ap eriodicity and related topics in tiling theory\, review the history of the search for for an aperiodic monotile\, and then discuss the hat and its m athematical properties.\nFull disclosure: this is the same title and abstr act that I just sent to Kevin Hare for the Numeration seminar the week bef ore (May 9th). I expect that the talks will be largely the same\, but if I have a chance to incorporate any connections to combinatorics on words in to my talk for you\, I will.\n \;\n\n\n\nThe address of the Zoom meeti ng is https://zoom.us/j/92245493528 . The password is distributed in annou ncements. If you want to receive them\, or receive them and want to unsubs cribe\, please write to Anna Frid.\nMore info: https://www.i2m.univ-amu.fr /wiki/Combinatorics-on-Words-seminar/ CATEGORIES:Combinatorics on Words Seminar,Virtual event LOCATION:Virtual event\, visioconférence\, virtual\, France X-APPLE-STRUCTURED-LOCATION;VALUE=URI;X-ADDRESS=visioconférence\, virtual\ , France;X-APPLE-RADIUS=100;X-TITLE=Virtual event:geo:0,0 END:VEVENT BEGIN:VTIMEZONE TZID:Europe/Paris X-LIC-LOCATION:Europe/Paris BEGIN:DAYLIGHT DTSTART:20230326T030000 TZOFFSETFROM:+0100 TZOFFSETTO:+0200 TZNAME:CEST END:DAYLIGHT END:VTIMEZONE END:VCALENDAR