2 papers
math.CO2016
The integrally representable trees of norm 3
Jack H. Koolen, Masood Ur Rehman, Qianqian Yang
In this paper, we determine the integrally representable trees of norm 3.
math.CO2016
An application of Hoffman graphs for spectral characterizations of graphs
Qianqian Yang, Aida Abiad, Jack H. Koolen
In this paper, we present the first application of Hoffman graphs for spectral characterizations of graphs. In particular, we show that the -clique extension of the $(t+1)\times…