3 papers
math.CO2026
Effect of edge-stretching on Steklov eigenvalues and sharp Steklov eigenvalue bounds on leaf--boundary trees
Jiangdong Ai, Yizhe Ji, Xiaopan Lian +1
Let be a finite tree with leaf set $\dO$ as the boundary and let be the first nontrivial Steklov eigenvalue. Let and be the maximum vertex degree and the numbe…
math.CO2024
New arithmetic invariants for cospectral graphs
Yizhe Ji, Quanyu Tang, Wei Wang +1
An invariant for cospectral graphs is a property shared by all cospectral graphs. In this paper, we establish three novel arithmetic invariants for cospectral graphs, revealing dee…
math.CO2023
Generalized spectral characterization of signed trees
Yizhe Ji, Wei Wang, Hao Zhang
Let be a tree with an irreducible characteristic polynomial over . Let be the discriminant of . It is proved that if …