. 2008 Apr 11;9:188. doi: 10.1186/1471-2105-9-188

Table 4.

The symbols of the three topological index families. The symbols of the three topological index families based on element-contact graphs are shown.

Index family	Indices based on SLCG		Indices based on SCG		Indices based on LCG

	weighted	unweighted	weighted	unweighted	weighted	unweighted
Wiener	$W_{S L}^{w}$	W_SL	$W_{S}^{w}$	W_S	$W_{L}^{w}$	W_L
Balaban	$J_{S L}^{w}$	J_SL	$J_{S}^{w}$	J_S	$J_{L}^{w}$	J_L
Randić	$\begin{matrix} 0 \end{matrix} χ_{S L}^{w}$ , $\begin{matrix} 1 \end{matrix} χ_{S L}^{w}$	⁰χ_SL, ¹χ_SL	$\begin{matrix} 0 \end{matrix} χ_{S}^{w}$ , $\begin{matrix} 1 \end{matrix} χ_{S}^{w}$	⁰χ_S, ¹χ_S	$\begin{matrix} 0 \end{matrix} χ_{L}^{w}$ , $\begin{matrix} 1 \end{matrix} χ_{L}^{w}$	⁰χ_L, ¹χ_L