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math.CO2021
Finding counterexamples for a conjecture of Akbari, Alazemi and Andjelić
Đorđe Stevanović, Ivan Damnjanović, Dragan Stevanović
For a graph , its energy is the sum of absolute values of the eigenvalues of its adjacency matrix, the matching number is the number of edges in a maximu…
math.CO2021
On circulant nut graphs
Ivan Damnjanović, Dragan Stevanović
A nut graph is a simple graph whose adjacency matrix has the eigenvalue~0 with multiplicity~1 such that its corresponding eigenvector has no zero entries. Motivated by a question o…