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DTSTART:20200329T030000
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DTSTART:20191027T020000
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DTSTAMP:20260405T190406Z
UID:5c8a5b8a74df2167620365@ist.ac.at
DTSTART:20191211T130000
DTEND:20191211T141500
DESCRIPTION:Speaker: Vojtech Kaluza\nhosted by Uli Wagner\nAbstract: The Co
 lin de Verdiere parameter ?(G) is known to capture some of theembeddabilit
 y properties of a graph G: For instance\, ?(G) ? 3 if and only ifG is plan
 ar and ?(G) ? 4 if and only if G is linkless embeddable. In orderto study 
 topological properties of graphs G with ?(G) > 4\, van der Holst andPendav
 ingh introduced a parameter ?(G). They showed that ?(G) ? k if andonly if 
 ?(G) ? k for k = 1\, 2\, 3\, 4. In addition\, they proved that ?(G) ? ?(G)
 +2for every G and conjectured that ?(G) ? ?(G) in general. They also showe
 dthat the two parameters may differ.In this talk\, after an introduction o
 n the parameters ? and ?\, I plan topresent a proof of the aforementioned 
 conjecture of van der Holst and Pen-davingh. This is a joint work with Mar
 tin Tancer.
LOCATION:Mondi Seminar Room 3\, Central Building\, ISTA
ORGANIZER:hwagner@ist.ac.at
SUMMARY:Vojtech Kaluza: GeomTop Seminar: Colin de Verdiere parameter and re
 presentations  of graphs
URL:https://talks-calendar.ista.ac.at/events/2444
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