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X-WR-CALNAME:[gt.go] - 'Three questions about graphs of large chromatic num
 ber' by Tassio Naia Dos Santos
X-WR-TIMEZONE:Europe/Paris
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TZID:Europe/Paris
TZUNTIL:20231029T010000Z
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DTSTART:20201025T030000
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TZOFFSETTO:+0100
RDATE:20211031T030000
RDATE:20221030T030000
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DESCRIPTION:/Exposé en anglais/Talk in english/ \n\nLet G be an arbitrary g
 raph with chromatic number k\, where k is large. We discuss the state of t
 he art of the following three open questions. \n\n• Erdős and Neumann-Lara
  (1979): does G admit an orientation with 'high' dichromatic number? (The 
 dichromatic number is the smallest size of a vertex partition in which eac
 h part induces an acyclic digraph.) \n• Burr (1980): is it true that every
  orientation of G contains all oriented trees of order k/2 +1 ? \n• Bukh (
 2015 or earlier): Is it true that typical subgraphs of G have chromatic nu
 mber at least ck/log k for some positive constant c\, independent of k ? 
 \n\n\n[Tassio Naia Dos Santos] (IME-USP) \n\nhttps://www.ime.usp.br/~tassi
 o/ \n\n\n{Remarques/Remarks} \n\n▼ \nCet exposé sera enregistré\, merci de
  désactiver votre webcam et micro si vous ne souhaitez pas apparaître sur 
 l'enregistrement. Les échanges informels avant et après l'exposé\, ainsi q
 ue 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 informel
 lement). Nous auront également des discussions informelles post-GT. \n\nÀ 
 très bientôt\, \n\nMarthe & Jonathan \n\nRetrouvez toutes les informations
  du GT dématérialisé sur https://combalgo.labri.fr/pmwiki.php/Groupe/GT-en
 -LIGNE \n\n\n▼ \nThis presentation will be recorded\, please deactivate yo
 ur webcam and microphone if you do not wish to appear on the recording. In
 formal exchanges before and after the presentation\, as well as questions\
 , will not be recorded. \n\nDo not hesitate to come a little before the st
 art of the presentation to test (and chat informally). We will also have i
 nformal post-working group discussions. \n\nSee you soon\, \n\nMarthe & 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:20211008T140000
DTEND;TZID=Europe/Paris:20211008T150000
LOCATION:A30/178 et sur https://u-bordeaux-fr.zoom.us/j/4939941120
SEQUENCE:0
SUMMARY:[gt.go] - 'Three questions about graphs of large chromatic number' 
 by Tassio Naia Dos Santos
TRANSP:OPAQUE
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