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A242953
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Number of connected graphs on n vertices whose spectrum has fewer than n distinct eigenvalues.
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1
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OFFSET
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1,4
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COMMENTS
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The spectrum refers to the eigenvalues of the adjacency matrix.
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LINKS
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CROSSREFS
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KEYWORD
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nonn,more
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AUTHOR
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EXTENSIONS
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Corrected, original description as the "non-real spectrum" was incorrect, by Travis Hoppe, Mar 23 2015
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STATUS
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approved
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