9 citations · 25 across the 9 of their papers we have counts for
4 papers · 1 filter
Some observations on the smallest adjacency eigenvalue of a graph
Sebastian M. Cioabă, Randall J. Elzinga, David A. Gregory
In this paper, we discuss various connections between the smallest eigenvalue of the adjacency matrix of a graph and its structure. There are several techniques for obtaining upper…
Connectivity concerning the last two subconstituents of a Q-polynomial distance-regular graph
Sebastian M. Cioabă, Jack H. Koolen, Paul Terwilliger
Let be a -polynomial distance-regular graph of diameter . Fix a vertex of and consider the subgraph induced on the union of the last two subconstituents of…
The spectral radius of graphs with no intersecting triangles
Sebastian Cioaba, Lihua Feng, Michael Tait +1
A graph on vertices consisting of triangles which intersect in exactly one common vertex is called a -fan and denoted by . This paper aims to determine the graph…
Open problems in the spectral theory of signed graphs
Francesco Belardo, Sebastian M. Cioabă, Jack H. Koolen +1
Signed graphs are graphs whose edges get a sign or (the signature). Signed graphs can be studied by means of graph matrices extended to signed graphs in a natural way. Re…