The molecular topological index and topological index are collectively known as the Schultz indices.
Schultz Indices
See also
Molecular Topological Index, Topological IndexExplore with Wolfram|Alpha
Cite this as:
Weisstein, Eric W. "Schultz Indices." From MathWorld--A Wolfram Web Resource. https://mathworld.wolfram.com/SchultzIndices.html