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math.CO2020
Mixed graphs with smallest eigenvalue greater than
Lu Lu, ZhenZhen Lou
The classical problem of characterizing the graphs with bounded eigenvalues may date back to the work of Smith in 1970. Especially, the research on graphs with smallest eigenvalues…
math.CO2020★ 10 cited
Quadratic Embedding Constants of Graph Joins
Zhenzhen Lou, Nobuaki Obata, Qiongxiang Huang
The quadratic embedding constant (QE constant) of a graph is a new characteristic value of a graph defined through the distance matrix. We derive formulae for the QE constants of t…