LSU College of Science


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Tuesday, October 27, 2020

Algebra and Number Theory Seminar  Questions or comments?

Posted October 17, 2020
Last modified October 18, 2020

3:10 pm - 4:00 pm Zoom 987 8361 8703

Jianping Pan, University of California, Davis
Crystal for stable Grothendieck polynomials

The Grothendieck polynomials arise from enumerative geometry, as they can be used to calculate the intersection numbers for the Flag varieties. We introduce a crystal on decreasing factorizations of 321-avoiding elements of the 0-Hecke monoid, whose generating functions are the stable Grothendieck polynomials. This crystal is a K-theoretic generalization of the Morse-Schilling crystal on decreasing factorizations in the symmetric group. We prove that it intertwines with the crystal on set-valued tableaux introduced by Monical, Pechenik, and Scrimshaw (through the residue map). We also define a new insertion algorithm that intertwines with our crystal, with surprising connections to the Hecke insertion algorithm and the uncrowding algorithm for set-valued tableaux.
This talk is based on joint work arXiv:1911.08732 with Jennifer Morse, Wencin Poh, and Anne Schilling.

Wednesday, October 28, 2020

Harmonic Analysis Seminar  Abstract and additional information

Posted October 8, 2020

3:30 pm - 4:30 pm Originally scheduled for 3:30 pm, Wednesday, October 14, 2020

Nicholas J Christoffersen, LSU