Two new types of real (i.e., noninteger) local vertex invariants (LOVIs), denoted by c o  and c' i  and called distance-enhanced exponential collectivities, are defined. Only the case when the exponent z equals 1 is discussed in detail. Both these LOVIs span the range from 0-1, but their dependence upon topology is fairly different, as seen from Table II, where c i  and c' i  values for all heptane and octane isomers are displayed
['Alexandru T. Balaban', 'Cornel Catana']
Search for nondegenerate real vertex invariants and derived topological indexes