BEGIN:VCALENDAR VERSION:2.0 PRODID:-//Drupal iCal API//EN X-WR-CALNAME:Events items teaser X-WR-TIMEZONE:America/Toronto BEGIN:VTIMEZONE TZID:America/Toronto X-LIC-LOCATION:America/Toronto BEGIN:DAYLIGHT TZNAME:EDT TZOFFSETFROM:-0500 TZOFFSETTO:-0400 DTSTART:20240310T070000 END:DAYLIGHT BEGIN:STANDARD TZNAME:EST TZOFFSETFROM:-0400 TZOFFSETTO:-0500 DTSTART:20241103T060000 END:STANDARD END:VTIMEZONE BEGIN:VEVENT UID:68d091c1750f9 DTSTART;TZID=America/Toronto:20250116T140000 SEQUENCE:0 TRANSP:TRANSPARENT DTEND;TZID=America/Toronto:20250116T150000 URL:/combinatorics-and-optimization/events/algebraic-an d-enumerative-combinatorics-seminar-leigh-foster SUMMARY:Algebraic and enumerative combinatorics seminar-Leigh Foster CLASS:PUBLIC DESCRIPTION:Summary \n\nTITLE:The squish map and the SL_2 double dimer mode l\n\nSpeaker\n Leigh Foster\n\nAffiliation\n University of 蓝莓视频\n\nLoc ation\n MC 5479\n\n聽ABSTRACT: A plane partition\, whose 3D Young diagram is made of unit\ncubes\, can be approximated by a \"coarser鈥� plane parti tion\, made of\ncubes of side length 2. Two such approximations can be obt ained by\n\"rounding up鈥� or \"rounding down鈥� to the nearest cube. We r elate\nthis coarsening (or downsampling) operation to Young's squish map\, \nintroduced in earlier work. We exhibit a related measure-preserving\nmap between the 2-periodic single dimer model on the honeycomb graph\,\nand a particular instance of Kenyon's SL_2 double dimer model on a\ncoarser hon eycomb graph. This allows us to apply existing computations\nfrom the 2-pe riodic single dimer partition function to a portion of\nthe parameter spac e of the the harder double dimer model. We also\nspecialize our map and ex hibit new criterion for the signed-tilability\nof a closed region on the h oneycomb graph.\n\nTHERE WILL BE A PRE-SEMINAR PRESENTING RELEVANT BACKGRO UND AT THE\nBEGINNING GRADUATE LEVEL STARTING AT 1PM\,\n DTSTAMP:20250922T000105Z END:VEVENT END:VCALENDAR