Diameter of General Knödel Graphs

Abstract

The Knödel graph WΔ,n is a Δ-regular bipartite graph on n ≥ 2Δ vertices where n is an even integer. In this paper We obtain some results about the distances of two vertices in the Knödel graphs and by them, we prove that diam(WΔ,n)=1+⌈n−22Δ−2⌉, where Δ ≥ 2 and n ≥ (2Δ – 5)(2Δ – 2) + 4.