J4 ›› 2012, Vol. 47 ›› Issue (12): 41-46.

• Articles • Previous Articles     Next Articles

On signless Laplace integral graphs of complete tripartite graphs

LU Shi-fang1, WEI Liang2, ZHAO Hai-xing2   

  1. 1. Department of Basic Research, Qinghai University, Xining 810016, Qinghai, China;
    2. Department of Mathematics and Information Science, Qinghai Normal University, Xining 810008, Qinghai, China
  • Received:2011-10-14 Online:2012-12-20 Published:2012-12-14

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Abstract:

 Necessary and sufficient conditions are obtained for complete tripartite graphs Km,n,l being Q-integral, and infinitely many new classes of such Q-integral graphs constructed.

Key words:  signless Laplace spectrum; Q-integral graphs; the complete tripartite graphs

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