Bounds for the Co-PI Index of a Graph

Document Type : Research Paper


1 Igdir University Science and Literature Faculty Department of Mathematics

2 Selcuk University Science Faculty Department of Mathematics


In this paper, we present some inequalities for the Co-PI index involving the some topological indices, the number of vertices and edges, and the maximum degree. After that, we give a result for trees. In addition, we give some inequalities for the largest eigenvalue of the Co-PI matrix of G.


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