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Several ordering relations of the minimum real toots of ajoint polynomials of graphs

REN Hai-zhen and LIU Ri-ying   

  1. Department of Mathematics and Information Science, Qinghai Normal Univ., Xining 810008, Qinghai, China
  • Received:2006-11-13 Revised:1900-01-01 Online:2006-10-24 Published:2006-10-24
  • Contact: REN Hai-zhen

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Abstract: Let Pn denote the path of order n. Dn represents the graph obtained from K3 and Pn-2 by identifying a vertex of　K3 with an endvertex of Pn-2(n≥4). The minimum real roots of the adjoint polynomials of some graphs are discussed, which are obtained from a connected graph by identifying two adjacent vertices respectively with two paths or two Dn or a path and a Dn, and establish some new corresponding ordering relations.

Key words: root , adjoint polynomial, chromatic polynomial

CLC Number: 

  • O157.5
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