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chromatic polynomial of empty graph

I know it is kind of silly, but the computation of the chromatic polynomial of the empty graph loops forever.

graphs.EmptyGraph().chromatic_polynomial()

(no question here... just a comment. I guess it is easy to correct, since it is supposed to be 1)

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chromatic polynomial of empty graph

I know it is kind of silly, but the computation of the chromatic polynomial of the empty graph loops forever.

graphs.EmptyGraph().chromatic_polynomial()

(no question here... just a comment. I guess it is easy to correct, since it is supposed to be 1)