3 papers
math.CO2026
An Ore-type Theorem for Oriented Discrepancy of Hamilton Cycles
Yufei Chang, Yangyang Cheng, Zhilan Wang +2
Oriented graph discrepancy problems focus on finding specific subgraphs within a given oriented graph that contain a significant number of edges in one direction. This concept…
math.GR2025
Complete classification of the Dehn functions of Bestvina-Brady groups
Yu-Chan Chang, Jerónimo GarcÃa-MejÃa, Matteo Migliorini
We prove that the Dehn function of every finitely presented Bestvina-Brady group grows as a linear, quadratic, cubic, or quartic polynomial. In fact, we provide explicit criteria o…
math.GR2025
A graphical description of the BNS-invariants of Bestvina-Brady groups and the RAAG recognition problem
Yu-Chan Chang, Lorenzo Ruffoni
A finitely presented Bestvina-Brady group (BBG) admits a presentation involving only commutators. We show that if a graph admits a certain type of spanning trees, then the associat…