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X-WR-CALNAME:[gt.go] - 'Further Extensions of the Grötzsch Theorem' by Hoan
 g La
X-WR-TIMEZONE:Europe/Paris
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TZID:Europe/Paris
TZUNTIL:20231029T010000Z
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DTSTART:20211031T030000
TZOFFSETFROM:+0200
TZOFFSETTO:+0100
RDATE:20221030T030000
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DTSTART:20210328T020000
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DESCRIPTION:Exposé sur des extensions du théorème de Grötzsch \n\n/Exposé e
 n anglais/Talk in english/ \n\nThe Grötzsch Theorem states that every tria
 ngle-free planar graph admits a proper 3-coloring. Among many of its gener
 alizations\, the one of Grünbaum and Aksenov\, giving 3-colorability of pl
 anar graphs with at most three triangles\, is perhaps the most known. A lo
 t of attention was also given to extending 3-colorings of subgraphs to the
  whole graph. In this paper\, we consider 3-colorings of planar graphs wit
 h at most one triangle. Particularly\, we show that precoloring of any two
  non-adjacent vertices and precoloring of a face of length at most 4 can b
 e extended to a 3-coloring of the graph. Additionally\, we show that for e
 very vertex of degree at most 3\, a precoloring of its neighborhood with t
 he same color extends to a 3-coloring of the graph. The latter result impl
 ies an affirmative answer to a conjecture on adynamic coloring. All the pr
 esented results are tight. \n\n\n[Hoang La] (LIRMM) \n\n[ https://www.tcs.
 uj.edu.pl/walczak | https://www.lirmm.fr/xuan-hoang-la/ ] \n\n\n{Remarques
 /Remarks} \n\n▼ \nCet exposé sera enregistré\, merci de désactiver votre w
 ebcam et micro si vous ne souhaitez pas apparaître sur l'enregistrement. L
 es échanges informels avant et après l'exposé\, ainsi que les questions\, 
 ne seront pas enregistrés. \n\nN'hésitez pas à venir un peu avant le début
  de l'exposé pour faire des tests (et discuter informellement). Nous auron
 t également des discussions informelles post-GT. \n\nÀ très bientôt\, \n\n
 Claire\, Marthe & Jonathan \n\nRetrouvez toutes les informations du GT dém
 atérialisé sur https://combalgo.labri.fr/pmwiki.php/Groupe/GT-en-LIGNE \n
 \n\n▼ \nThis presentation will be recorded\, please deactivate your webcam
  and microphone if you do not wish to appear on the recording. Informal ex
 changes before and after the presentation\, as well as questions\, will no
 t be recorded. \n\nDo not hesitate to come a little before the start of th
 e presentation to test (and chat informally). We will also have informal p
 ost-working group discussions. \n\nSee you soon\, \n\nClaire\, Marthe & Jo
 nathan \n\nFind all the information of the dematerialized working group on
  the web page https://combalgo.labri.fr/pmwiki.php/Groupe/GT-en-LIGNE
DTSTART;TZID=Europe/Paris:20211029T140000
DTEND;TZID=Europe/Paris:20211029T150000
LOCATION:A30/178 et sur https://u-bordeaux-fr.zoom.us/j/4939941120
SEQUENCE:0
SUMMARY:[gt.go] - 'Further Extensions of the Grötzsch Theorem' by Hoang La
TRANSP:OPAQUE
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