2 papers
math.CO2024
Distance-regular graphs with a few -distance eigenvalues
Mamoon Abdullah, Brhane Gebremichel, Sakander Hayat +1
In this paper we study when the -distance matrix of a distance-regular graph has few distinct eigenvalues. We mainly concentrate on diameter 3.
math.CO2023
Distance-regular graphs with exactly one positive -distance eigenvalue
Jack H. Koolen, Mamoon Abdullah, Brhane Gebremichel +1
In this paper, we study the -distance matrix for a distance-regular graph and show that the -distance matrix of a distance-regular graph with classical parameters ($D, q, α,…