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DTSTART:20210314T070000
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DTSTART;TZID=America/Toronto:20210318T130000
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URL:https://uwaterloo.ca/combinatorics-and-optimization/events/algebraic-co
 mbinatorics-seminar-david-wagner-4
SUMMARY:Algebraic Combinatorics Seminar - David Wagner
CLASS:PUBLIC
DESCRIPTION:TITLE: The Poset Conjecture: results\, counterexamples\, and o
 pen\nproblems\n\nSpeaker:\n David Wagner\n\nAffiliation:\n University of W
 aterloo\n\nZoom:\n Contact Karen Yeats\n\nABSTRACT:\n\nIn 1978\, Neggers c
 onjectured that a certain transform of the order\npolynomial of a partiall
 y ordered set (poset) has only real roots.\n\nIn the late 1980s\, Stanley 
 gave this to me as a thesis project\,\ngeneralized to labelled posets.  F
 or my thesis I proved the\nconclusion for series-parallel labelled posets 
 and a bit more. \nBr\\\"and\\'en\, and later Stembridge\, found counterex
 amples to the\nconjecture in general.
DTSTAMP:20260406T163117Z
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