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DTSTART:20230312T070000
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DTSTART:20221106T060000
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DTSTART;TZID=America/Toronto:20230914T140000
SEQUENCE:0
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URL:https://uwaterloo.ca/combinatorics-and-optimization/events/algebraic-an
 d-enumerative-combinatorics-seminar-tianyi-yu
SUMMARY:Algebraic and Enumerative Combinatorics Seminar - Tianyi Yu
CLASS:PUBLIC
DESCRIPTION:TITLE: Analogue of Fomin-Stanley algebra on bumpless pipedreams
 \n\nSPEAKER:\n Tianyi Yu\n\nAFFILIATION:\n University of California\n\nLOC
 ATION:\n MC 6029\n\nThere will be a pre-seminar presenting relevant backgr
 ound at the\nbeginning graduate level starting at 1:00 pm.\n\nABSTRACT: Sc
 hubert polynomials are distinguished representatives of\nSchubert cells in
  the cohomology of the flag variety. Pipedreams (PD)\nand bumpless pipedre
 ams (BPD) are two combinatorial models of Schubert\npolynomials. There ar
 e many classical perspectives to view PDs: Fomin\nand Stanley represented 
 each PD as an element in the NilCoexter\nalgebra\; Lenart and Sottile conv
 erted each PD into a labeled chain in\nthe Bruhat order. In this talk\, we
  unravel the BPD analogues of both\nviewpoints.\n\nOne application of our 
 results is a simple bijection between PDs and\nBPDs via Lenart's growth di
 agram.
DTSTAMP:20260405T175536Z
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