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math.CO2022★ 7 cited
Primary Non-QE Graphs on Six Vertices
Nobuaki Obata
A connected graph is called of non-QE class if it does not admit a quadratic embedding in a Euclidean space. A non-QE graph is called primary if it does not contain a non-QE graph…
math.CO2022★ 5 cited
Complete Multipartite Graphs of Non-QE Class
Nobuaki Obata
We derive a formula for the QE constant of a complete multipartite graph and determine the complete multipartite graphs of non-QE class, namely, those which do not admit quadratic…