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UID:71d5c930-5f82-4897-bed5-d48c0438ba18
X-WR-CALNAME:[gt.go] - 'Colouring graphs with forbidden 7-vertex minors' by
  Agnes Totschnig
X-WR-TIMEZONE:Europe/Paris
BEGIN:VTIMEZONE
TZID:Europe/Paris
TZUNTIL:20271031T010000Z
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TZNAME:CET
DTSTART:20251026T030000
TZOFFSETFROM:+0200
TZOFFSETTO:+0100
RDATE:20261025T030000
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DTSTART:20250330T020000
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RDATE:20260329T020000
RDATE:20270328T020000
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UID:71d5c930-5f82-4897-bed5-d48c0438ba18
DTSTAMP:20260430T175641Z
CLASS:PUBLIC
DESCRIPTION:In 1943\, Hadwiger conjectured that every k-chromatic graph has
  a K_k-minor. While the cases k = 5 and k = 6 have been shown to be equiva
 lent to the Four Colour Theorem\, respectively by Wagner\, and in seminal 
 work by Robertson\, Seymour and Thomas\, the cases k at least 7 remain ope
 n. We show that any 7-chromatic graph has as a minor the complete graph K_
 7 with two adjacent edges removed\, by extending work of Kawarabayashi and
  Toft and by proving a new edge-extremal bound. This improves Jakobsen’s r
 esult with two arbitrary edges removed. \n\nJoint work with Sergey Norin. 
 \n\n(Agnes Totschnig) [MIT] \n\n\nVérifiez que vous êtes bien inscrits sur
  le site du [gdr-ifm-gt-graphes] : [ https://gtgraphes.labri.fr/pmwiki/pmw
 iki.php/Equipes/Equipes#membres | https://gtgraphes.labri.fr/pmwiki/pmwiki
 .php/Equipes/Equipes#membres ] \n\nRemarks / Remarques \n\nFind all the in
 formation of the working group on this [ https://graphesetoptimisation.lab
 ri.fr/pmwiki.php/Groupe/GT?userlang=en | web page ] . \nRetrouvez toutes l
 es informations du GT sur cette [ https://graphesetoptimisation.labri.fr/p
 mwiki.php/Groupe/GT | page web ] . \n\n\n\nImport automatique depuis https
 ://webmel.u-bordeaux.fr/home/bf-labri.ca@u-bordeaux.fr/gt.go.ics par sync_
 icals_to_drupal.py pour GT-GO
DTSTART;TZID=Europe/Paris:20260116T140000
DTEND;TZID=Europe/Paris:20260116T150000
LOCATION:LaBRI/178
SEQUENCE:0
SUMMARY:[gt.go] - 'Colouring graphs with forbidden 7-vertex minors' by Agne
 s Totschnig
TRANSP:OPAQUE
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