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DTSTART:20230101T000000
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DTSTART;TZID=UTC:20230920T153000
DTEND;TZID=UTC:20230920T163000
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CREATED:20230915T200900Z
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UID:7306-1695223800-1695227400@aarms.math.ca
SUMMARY:Atlantic Graph Theory Seminar
DESCRIPTION:Time: 3.30pm\, Atlantic time\, Wednesday Sept.20\nSpeaker: Jessica McDonald\, Auburn University\n\nTitle: On flows (and group-connectivity) in signed graphs \nAbstract:\n\n\n\n\n\n\nIn this talk we’ll start by discussing flows in signed graphs and how it generalizes the usual notion of integer flows in graphs. In particular\, flow-colouring duality of graphs in the plane can be re-interpreted using signed graphs in the projective plane. Also\, where a flow in a graph can be viewed as a sum of flows on cycles\, in a signed graph\, positive cycles and barbells are the key structures to consider. We’ll share a new result\, joint with K. Nurse and A. Brewer-Castano\, about flows in 3-edge-connected signed graphs. In fact\, this result holds for the stronger notion of group-connectivity\, which was introduced as a generalization of flows by Jaeger\, Linial\, Payan\, and Tarsi in 1992. Building on their work and also on work by Li\, Luo\, Ma and Zhang (2018)\, we (mostly) establish a group-connected analog of Seymour’s 6-flow Theorem for signed graphs. \n\n\n\n\n\n\nZoom link:\nhttps://us02web.zoom.us/j/86415230827?pwd=QUxLUnlMdWYzL05zSUJ4bnBCOUJnZz09\n\nMeeting ID: 864 1523 0827\nPasscode: 835547
URL:https://aarms.math.ca/event/atlantic-graph-theory-seminar-2/
LOCATION:Online via Zoom
CATEGORIES:AARMS Atlantic Graph Theory Seminar
ORGANIZER;CN="jeannette%20Janssen":MAILTO:jeannette.janssen@dal.ca
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