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:20250309T070000
END:DAYLIGHT
BEGIN:STANDARD
TZNAME:EST
TZOFFSETFROM:-0400
TZOFFSETTO:-0500
DTSTART:20251102T060000
END:STANDARD
END:VTIMEZONE
BEGIN:VEVENT
UID:6a211a7c5d246
DTSTART;TZID=America/Toronto:20251117T150000
SEQUENCE:0
TRANSP:TRANSPARENT
DTEND;TZID=America/Toronto:20251117T160000
URL:https://uwaterloo.ca/combinatorics-and-optimization/events/graphs-and-m
 atroids-jonathan-leake-0
SUMMARY:Graphs and Matroids - Jonathan Leake
CLASS:PUBLIC
DESCRIPTION:TITLE:The Heron-Rota-Welsh conjecture via Lorentzian polynomial
 s\n\nSPEAKER:\n Jonathan Leake\n\nAFFILIATION:\n University of Waterloo\n\
 nROOM:\n MC 6029\n\nABSTRACT:The Heron-Rota-Welsh conjecture asserts that 
 the\ncharacteristic polynomial of a matroid has log-concave coefficients.\
 nThis conjecture was open since the 1970s until it was proven by\nAdiprasi
 to\, Huh\, and Katz in 2018 using their newly developed\ncombinatorial Hod
 ge theory. Their proof was groundbreaking\, but rather\ncomplicated. In th
 is talk\, we will give a proof of this fact using\nLorentzian polynomials\
 , which otherwise will use nothing more than\nbasic theory of matroids\, l
 inear algebra\, and convexity.
DTSTAMP:20260604T062604Z
END:VEVENT
END:VCALENDAR