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I'm doing some research about a kind of families of graphs including incidence graph of some graphs? I want to know how it affect the graphs and the eigenvalues? besides, Do you know how I can study about incidence graph of Projective plane and its spectrum? What is this graph and its eigenvalues?

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  • $\begingroup$ What do you mean by "incidence graph of Projective plane? Of course I know what the "incidence graph" of any (hyper-)graph is, but "Projective plane" has more than one meaning. $\endgroup$ – Peter Heinig Feb 21 '18 at 8:09
  • $\begingroup$ "Projective plane" has more than one meaning? $\endgroup$ – Chris Godsil Feb 21 '18 at 23:19

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