2 papers
math.CO2019
EL-Shelling on Comodernistic Lattices
Tiansi Li
We prove the equivalence of EL-shellability and the existence of recursive atom ordering independent of roots. We show that a comodernistic lattice, as defined by Schweig and Woodr…
math.CO2019
CL-Shellable Posets with No EL-Shellings
Tiansi Li
We construct an ungraded CL-shellable poset and a graded CL-shellable poset and show that neither is EL-shellable.