M-polynomial and Degree-based Topological Indices

Deutsch, E.; Klavžar, S.

doi:10.22052/ijmc.2015.10106

M-polynomial and Degree-based Topological Indices

Document Type : Research Paper

Authors

E. Deutsch ¹

S. Klavžar ²

¹ Polytechnic Institute of New York University

² Faculty of Mathematics and Physics, University of Ljubljana, Slovenia

10.22052/ijmc.2015.10106

Abstract

Let $G$ be a graph and let $m_{ij}(G)$, $i,jge 1$, be the number of edges $uv$ of $G$ such that ${d_v(G), d_u(G)} = {i,j}$. The {em $M$-polynomial} of $G$ is introduced with $displaystyle{M(G;x,y) = sum_{ile j} m_{ij}(G)x^iy^j}$. It is shown that degree-based topological indices can be routinely computed from the polynomial, thus reducing the problem of their determination in each particular case to the single problem of determining the $M$-polynomial. The new approach is also illustrated with examples.

Keywords

Degree-based topological index

Zagreb index

Randic index

Graph polynomial

Subjects