Application of some techniques in Sperner Theory: Optimal orientations of vertex-multiplications of trees with diameter 4

W. H. W. Wong, E. G. Tay

Koh and Tay proved a fundamental classification of $G$ vertex-multiplications into three classes ${\mathcal{C}}_0,{\mathcal{C}}_1$ and ${\mathcal{C}}_2$. They also showed that any verte…