The vertex PI index and Szeged index of bridge graphs Original Research Article

Recently the vertex Padmakar–Ivan (image) index of a graph image was introduced as the sum over all edges image of image of the number of vertices which are not equidistant to the vertices image and image. In this paper the vertex PI index and Szeged index of bridge graphs are determined. Using these formulas, the vertex PI indices and Szeged indices of several graphs are computed.