Integral graph

In the mathematical field of graph theory, an integral graph is a graph whose spectrum consists entirely of integers. In other words, a graphs is an integral graph if all the eigenvalues of its characteristic polynomial are integers.[1]

The notion was introduced in 1974 by Harary and Schwenk.[2]

Examples

References

  1. Weisstein, Eric W. "Integral Graph". MathWorld.
  2. Harary, F. and Schwenk, A. J. "Which Graphs have Integral Spectra?" In Graphs and Combinatorics (Ed. R. Bari and F. Harary). Berlin: Springer-Verlag, pp. 4551, 1974.
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