Anton Perdih,* Branislav Perdih
Mala vas 12, SI-1000 Ljubljana, Slovenia
The largest eigenvalues of the "mean degree of vertices" matrices form a group of the BIM type indices. They are good indices for indexing the influence of the size of molecule, but less good as branching indices. True but degenerated branching indices are the indices A?(0), G?(0), Ln?(0), RA?(0), RG?(0), RLn?(0), and RZg?(0). Regular sequences of isomers on increasing branching have only the indices RA?(-1), RG?(-1; -2), and RLn?(-1).