2 papers
math.CO2026
On the combinatorial structure of graphs with a spectral idempotent of small dual diameter
Edwin R. van Dam, Giusy Monzillo, Safet Penjić
Let be a connected regular graph with an eigenvalue and corresponding idempotent . Let be the algebra generated by and $E_λ…
math.CO2021
On certain regular nicely distance-balanced graphs
Blas Fernandez, Štefko Miklavič, Safet Penjić
A connected graph $\G$ is called {\em nicely distance--balanced}, whenever there exists a positive integer $γ=γ(\G)$, such that for any two adjacent vertices of $\G$ there ar…