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TZID:Europe/Vienna
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DTSTART:20190331T030000
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DTSTART:20191027T020000
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DTSTAMP:20191023T110854Z
UID:5ba209fb35c99313190053@ist.ac.at
DTSTART:20190509T133000
DTEND:20190509T153000
DESCRIPTION:Speaker: Lilla Tóthmérész\nhosted by Tamas Hausel\nAbstract:
I will talk about the sandpile group of finite graphs and directed graphs
. I will state the Riemann-Roch theorem for graphs (due to Baker-Norine)\,
say what can be known about the case of directed graphs\, and how these t
hings are connected to feedback arc sets. (This part is joint work with Bl
int Hujter.)I will also talk about a very nice connection between sandpile
groups of ribbon graphs and planarity: By Chan-Church-Grochow and Baker-W
ang\, certain actions of the sandpile group of a ribbon graph on the spann
ing trees are canonical if and only if the ribbon structure is planar. Wit
h Tams Klmn and Seunghun Lee we gave a canonical definition for this actio
n in the planar case.
LOCATION:Big Seminar room Ground floor / Office Bldg West (I21.EG.101)\, IS
T Austria
ORGANIZER:cpetz@ist.ac.at
SUMMARY:Sandpile group of graphs and digraphs
URL:https://talks-calendar.app.ist.ac.at/events/1863
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