Safet Penjić

activity

20192022

collaborators

3 papers

math.CO2022

On (almost) $2$ - $Y$ -homogeneous distance-biregular graphs

Blas Fernandez, Safet Penjic

Let $Γ$ denote a bipartite graph with vertex set $X$ , color partitions $Y$ , $Y^{'}$ , and assume that every vertex in $Y$ has eccentricity $D \geq 3$ . For $z \in X$ and a non-negative int…

math.CO2020

On symmetric association schemes and associated quotient-polynomial graphs

M. A. Fiol, Safet Penjić

Let $Γ$ denote an undirected, connected, regular graph with vertex set $X$ , adjacency matrix $A$ , and $d + 1$ distinct eigenvalues. Let $A = A (Γ)$ denote the su…

math.CO2019

On a version of the spectral excess theorem

M. A. Fiol, Safet Penjić

Given a regular (connected) graph $Γ = (X, E)$ with adjacency matrix $A$ , $d + 1$ distinct eigenvalues, and diameter $D$ , we give a characterization of when its distance matrix $A_{D}$ is…

On (almost) 2-Y-homogeneous distance-biregular graphs

On symmetric association schemes and associated quotient-polynomial graphs

On a version of the spectral excess theorem

On (almost) $2$ - $Y$ -homogeneous distance-biregular graphs