BEGIN:VCALENDAR VERSION:2.0 PRODID:researchseminars.org CALSCALE:GREGORIAN X-WR-CALNAME:researchseminars.org BEGIN:VEVENT SUMMARY:Lauren K. Williams (Harvard University & Radcliffe Institute) DTSTART:20200605T193000Z DTEND:20200605T202000Z DTSTAMP:20260404T111323Z UID:TutteColloquium/1 DESCRIPTION:Title: Matroids\, tropical geometry\, and positivity\nby Laure n K. Williams (Harvard University & Radcliffe Institute) as part of Distin guished Tutte Lecture Series\n\n\nAbstract\nThe theory of matroids -- a cl ass of combinatorial objects which simultaneously generalize graphs as wel l as vectors in a vector space -- was pioneered by William Tutte in his 19 48 PhD thesis. Matroids are also closely connected to the Grassmannian an d the tropical Grassmannian. In recent years\, mathematicians and physici sts have been exploring positive notions of all of these objects\, finding applications to scattering amplitudes and shallow water waves. In my tal k I will give an introduction to matroids\, tropical geometry\, and positi vity\, and survey some of the beautiful results and applications.\n LOCATION:https://stable.researchseminars.org/talk/TutteColloquium/1/ END:VEVENT END:VCALENDAR