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arxiv: 1502.07093 · v2 · pith:MN7EPL2Cnew · submitted 2015-02-25 · 🧮 math.CO

A Note on the Gutman Index of Jaco Graphs

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The concept of the \emph{Gutman index}, denoted $Gut(G)$ was introduced for a connected undirected graph $G$. In this note we apply the concept to the underlying graphs of the family of Jaco graphs, (\emph{directed graphs by definition}), and describe a recursive formula for the \emph{Gutman index} $Gut(J^*_{n+1}(x)).$ We also determine the \emph{Gutman index} for the trivial \emph{edge-joint} between Jaco graphs.

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