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URL:https://uwaterloo.ca/combinatorics-and-optimization/events/tutte-colloq
 uium-oliver-pechenik
SUMMARY:Tutte Colloquium - Oliver Pechenik
CLASS:PUBLIC
DESCRIPTION:TITLE: Partial orders on the symmetric group\n\nSpeaker:\n Oli
 ver Pechenik\n\nAffiliation:\n University of Waterloo\n\nZoom:\n Please em
 ail Emma Watson\n\nABSTRACT:\n\nThe symmetric group of permutations is na
 turally a poset in at least 4\ndifferent ways\, the (strong) Bruhat order 
 and three flavors of weak\norder. Stanley showed in 1980 that the Bruhat o
 rder is Sperner\,\nessentially meaning that the obvious large antichains a
 re in fact the\nlargest possible. The corresponding fact for weak orders w
 as open\nuntil last year\, when it was established by Gaetz and Gao.
DTSTAMP:20260406T164940Z
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