On sign-symmetric signed graphs

Ebrahim Ghorbani, Willem H. Haemers, Hamid Reza Maimani, Leila Parsaei Majd

Research output: Contribution to journalArticleScientificpeer-review

13 Citations (Scopus)


A signed graph is said to be sign-symmetric if it is switching isomorphic to its negation. Bipartite signed graphs are trivially sign-symmetric. We give new constructions of non-bipartite sign-symmetric signed graphs. Sign-symmetric signed graphs have a symmetric spectrum but not the other way around. We present constructions of signed graphs with symmetric spectra which are not sign-symmetric. This, in particular answers a problem posed by Belardo, Cioabă, Koolen, and Wang (2018).
Original languageEnglish
Pages (from-to)83-93
JournalArs Mathematica Contemporanea
Issue number1
Publication statusPublished - Mar 2020


  • signed graph
  • spectrum


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