Extremal reformulated forgotten index of trees, unicyclic and bicyclic graphs

Ishita Sarkar, Manjunath Nanjappa, Ivan Gutman


The reformulated forgotten index (RF) is the edge version of the ordinary forgotten index. We
describe graph transformations, bymeans ofwhich RF increases or decreases. Using these transformations,
the trees, unicyclic, and bicyclic graphs extremal w.r.t. RF are characterized.


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