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DTSTART:20240310T070000
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DTSTART:20241103T060000
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DTSTART;TZID=America/Toronto:20250306T140000
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URL:https://uwaterloo.ca/combinatorics-and-optimization/events/algebraic-an
 d-enumerative-combinatorics-seminar-andrew-sack
SUMMARY:Algebraic and enumerative combinatorics seminar-Andrew Sack
CLASS:PUBLIC
DESCRIPTION:TITLE: Operahedron Lattices\n\nSpeaker\n Andrew Sack\n\nAffili
 ation\n University of Michigan\n\nLocation\n MC 5479\n\n ABSTRACT: Two c
 lassical lattices are the Tamari lattice on\nbracketings of a word and the
  weak order on permutations. The Hasse\ndiagram of each of these lattices 
 is the oriented 1-skeleton of a\npolytope\, theassociahedron and the permu
 tohedron respectively. We\nexamine a poset on bracketings of rooted trees 
 whose Hasse diagram is\nthe oriented 1-skeleton of a polytope called th op
 erahedron. We show\nthis poset is a lattice which answers question of Lapl
 ante-Anfossi.\nThese lattices provide an extremelynatural generalization o
 f both the\nTamari lattice and the weak order.\n\nTHERE WILL BE A PRE-SEMI
 NAR PRESENTING RELEVANT BACKGROUND AT THE\nBEGINNING GRADUATE LEVEL STARTI
 NG AT 1PM\,
DTSTAMP:20260403T082834Z
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