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math.CO2020
On a question of Haemers regarding vectors in the nullspace of Seidel matrices
Saieed Akbari, Sebastian M. Cioabă, Samira Goudarzi +2
In 2011, Haemers asked the following question: If is the Seidel matrix of a graph of order and is singular, does there exist an eigenvector of corresponding to …
math.CO2020
Spectral conditions for graph rigidity in the Euclidean plane
Sebastian M. Cioabă, Sean Dewar, Xiaofeng Gu
Rigidity is the property of a structure that does not flex. It is well studied in discrete geometry and mechanics, and has applications in material science, engineering and biologi…