When do quasisymmetric functions know that trees are different?
January 31, 2023
A famous conjecture of Stanley states that his chromatic symmetric function distinguishes trees. As a quasisymmetric analogue, we conjecture that the chromatic quasisymmetric function of Shareshian and Wachs and of Ellzey distinguishes directed trees. This latter conjecture would be implied by an affirmative answer to a question of Hasebe and Tsujie about the P-partition enumerator distinguishing posets whose Hasse diagrams are trees. They proved the case of rooted trees and our results include a generalization of their result. Open problems will be sprinkled throughout.
This is joint work with Jean-Christophe Aval and Karimatou Djenabou.
Event Details
January 31, 2023
4:00pm to 5:00pm
Zoom
HTTPS://UBC.ZOOM.US/J/62676242229?PWD=RURTUC9UYXEWEVZTMTNGT1EVY1FLZZ09
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