2 papers
math.CO2026
All eigenvalues of the blowup of a graph
Ge Lin, Changjiang Bu
The -blowup of a graph () is the -uniform hypergraph obtained by replacing each vertex with a set of size and preserving the adjacency relation. In this paper, w…
math.CO2025
The characteristic polynomial of sunflowers
Changjiang Bu, Lixiang Chen, Ge Lin
A uniform hypergraph is called a sunflower if all of its hyperedges intersect in the same set of vertices. In this paper, we determine the eigenvalues and spectral moments of a sun…