Greg Markowsky

collaborators

2 papers

math.CO2026

An improved bound for strongly regular graphs with smallest eigenvalue $- m$

Jack Koolen, Chenhui Lv, Greg Markowsky +1

In 1979, Neumaier gave a bound on $I^»$ in terms of $m$ and $I^¼$ , where $- m$ is the smallest eigenvalue of a primitive strongly regular graph, unless the graph in question belongs t…

math.CO2024

Non-geometric distance-regular graphs of diameter at least $3$ with smallest eigenvalue at least $- 3$

Jack Koolen, Kefan Yu, Xiaoye Liang +2

In this paper, we classify non-geometric distance-regular graphs of diameter at least $3$ with smallest eigenvalue at least $- 3$ . This is progress towards what is hoped to be an ev…

An improved bound for strongly regular graphs with smallest eigenvalue −m

Non-geometric distance-regular graphs of diameter at least 3 with smallest eigenvalue at least −3

An improved bound for strongly regular graphs with smallest eigenvalue $- m$

Non-geometric distance-regular graphs of diameter at least $3$ with smallest eigenvalue at least $- 3$