Regularities of Typical Sigma Index on Caterpillar Trees of Pendent Vertices

Abstract: In this paper, we present a study of topological indices according to caterpillar trees through Albertson index $\operatorname{irr}(G)=\sum_{\operatorname{ur\in E}(G)}\left|d_G(u)-d_G(v)\right|$ and the sigma index and total sigma index $\sigma_{t}(G)=\sum_{1\leq i < j \leq n} (d_{i}-d_{j})^{2}$, which analyses the maximum and minimum values for specific graph properties under certain restrictions of caterpillar tree, where albertson index on caterpillar tree define as $\operatorname{irr}(C(n,m))=\sum_{n=3, m=3}(m-2)(10n-1)$. Through the election of these topological indices, we provide efficient models of these indices on caterpillar trees, as it is known that the Albertson index is the basis on which most of the topological indices are built and we have shown this through the close correlation between the Albertson's index and the Sigma index.