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In his survey "Beyond graph energy: Norms of graphs and matrices" (2016), Nikiforov proposed two problems concerning characterizing the graphs that attain equality in a lower bound and in a upper bound for the energy of a graph, respectively. We show
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::7f016739f38c2d1b1546a054a5647373
http://arxiv.org/abs/2010.01468
http://arxiv.org/abs/2010.01468
