2 papers
math.CO2026
Equal Lagrange Numbers with Non-Isomorphic Band Graphs: A Counterexample to Schiffler's Problem 6.3
Qiyue Tang, Yizhi Zhang
We consider the following question: if two lattice paths in the same set have the same Lagrange number, must their band graphs be isomorphic? We exhibit two expl…
math.RA2025
Pure Core Sets of Matrices over Finite Fields
Hongyu Wang, Yizhi Zhang
This paper studies the structure of core sets under different similarity classes. We investigate the influence of factors of the minimal polynomial with different degrees on the st…