2 papers
math.CO2026
Two infinite families of counterexamples to the Stanley--Gasharov conjecture
David G. L. Wang, K. Zhang, T. Y. Zhao
The paper identifies an infinite family of connected line graphs whose chromatic symmetric functions are not Schur‑positive, providing infinitely many counterexamples to the Stanle…
math.CO2026
Classical and vincular patterns of length three in generalized alternating permutations
Zhenhua Luo, Junting Wang, Ziyi Yang +2
Let k be an integer at least 2, and let D_{N,k} be the set of permutations of {1,...,N} whose descent set is exactly {k, 2k, ..., k*floor((N-1)/k)}. We enumerate the elements of D_…