On labelling complete tripartite graphs
M. A. Seoud, Maged Zakaria Youssef · International Journal of Mathematical Education in Science and Technology · 1997
We show that the graphs K 1,n,p and K 2,2,p are graceful. We prove that not all the graphs Km,np are harmonious, and we conjecture that all the graphs K m,n,p are graceful. We show also that the graph K 1,1, p,q is graceful and harmonious. Finally we show that the graphs B(3, 2, m) and B(4, 3, m) are harmonious.