Results 61 to 70 of about 10,946,765 (186)

Eccentricity-Based Topological Indices of a Cyclic Octahedron Structure

Mathematics, 2018
In this article, we study the chemical graph of a cyclic octahedron structure of dimension n and compute the eccentric connectivity polynomial, the eccentric connectivity index, the total eccentricity, the average eccentricity, the first Zagreb index ...
Manzoor Ahmed Zahid, Abdul Qudair Baig, Muhammad Naeem, Muhammad Razwan Azhar   +3 more
doaj   +1 more source

The Calculations of Topological Indices on Certain Networks

Journal of Mathematics, 2021
It is one of the core problems in the study of chemical graph theory to study the topological index of molecular graph and the internal relationship between its structural properties and some invariants.
Jia-Bao Liu, Ting Zhang, Sakander Hayat
doaj   +1 more source

Computing zagreb indices and zagreb polynomials of fullerene, butterfly and benes networks

, 2019
A topological index is a numerical parameter of a graph which characterizes some of the topological properties of the graph. The concepts of hyper-Zagreb index, first multiple Zagreb index, second multiple Zagreb index and relatedly the Zagreb ...
Cangül, I.N., Siddiqui, M.K., Farahani, M.R., Xu, J.   +3 more
core   +1 more source

Hyper-Zagreb index in fuzzy environment and its application

Heliyon
The Zagreb indices (ZIs) are important graph invariants that are used extensively in many different fields in mathematics and chemistry, such as network theory, spectral graph theory, fuzzy graph theory (FGT) and molecular chemistry, etc. The hyper-ZI is
Sk Rabiul Islam, Bandar Bin Mohsin, Madhumangal Pal   +2 more
doaj   +1 more source

The double star sequences and the general second Zagreb index

Matematychni Studii, 2019
For a simple graph we introduce notions of the double star sequence, the double star frequently sequence and prove that these sequences are inverses of each other. As a consequence, we express the general second Zagreb index in terms of the double star sequence.
openaire   +2 more sources

Computing the forgotten topological index of four operations on graphs

AKCE International Journal of Graphs and Combinatorics, 2017
For a (molecular) graph, the first Zagreb index is equal to the sum of squares of the degrees of vertices, and the second Zagreb index is equal to the sum of the products of the degrees of pairs of adjacent vertices.
Shehnaz Akhter, Muhammad Imran
doaj   +1 more source

Entropy measures of dendrimers using degree based indices

South African Journal of Chemical Engineering
Topological indices play a crucial role as molecular descriptors in QSAR/QSPR research. Graph entropy measurements are of great importance in various fields like chemistry, discrete mathematics, and biology.
Ali Ovais, Farhana Yasmeen, Muhammad Irfan, Muhammad Waheed Rasheed, Sumera Kousar   +4 more
doaj   +1 more source

New bounds on the hyper-Zagreb index for the simple connected graphs

, 2018
The hyper-Zagreb index of a simple connected graph G is defined by χ2(G) = ∑uv ∈ E(G)(d(u) + d(v))2. In this paper, we establish, analyze and compare some new upper bounds on the Hyper-Zagreb index in terms of the number of vertices n, number of edges m,
Mohammad Ali Rostami, Suresh Elumalai, Toufik Mansour   +2 more
core   +1 more source

Second Leap Zagreb & Second Leap Hyper Zagreb Entropy values for F_r.

, 2023
Second Leap Zagreb & Second Leap Hyper Zagreb Entropy values for Fr.
Mehar Ali Malik (17364518), Muhammad Imran (282621), Muhammad Adeel (1735018)   +2 more
core   +1 more source

Zbornik radova s konferencije "65th Anniversary Conference of the Institute of Economics, Zagreb" [PDF]

, 2005
U okviru obilježavanja 65. obljetnice djelovanja Ekonomskog instituta, Zagreb od 18. do 19. studenog 2004. održana je međunarodna znanstvena konferencija 65th Anniversary Conference of the Institute of Economics, Zagreb. Radovi prihvaćeni za konferenciju

core   +1 more source