Iterated line graphs with only negative eigenvalues $-2$, their complements and energy

Harishchandra S. Ramane, B. Parvathalu, Daneshwari Patil +1

The graphs with all equal negative or positive eigenvalues are special kind in the spectral graph theory. In this article, several iterated line graphs ${\mathcal{L}}^k(G)$ with all…