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Proof of a conjecture of Graham and Lov\'asz concerning unimodality of coefficients of the distance characteristic polynomial of a tree. (arXiv:1507.02341v3 [math.CO] UPDATED)
来源于:arXiv
We establish a conjecture of Graham and Lov\'asz that the (normalized)
coefficients of the distance characteristic polynomial of a tree are unimodal;
we also prove they are log-concave. 查看全文>>
