eng
Shahid Rajaee Teacher Training University
Journal of Mathematical Nanoscience
2538-2314
2538-2314
2014-06-01
4
1-2
1
11
10.22061/jmns.2014.477
477
On the spectrum of Cayley graphs via character table
Farzaneh Nowroozi
1
Modjtaba Ghorbani
mghorbani@srttu.edu
2
Department of Mathematics, Faculty of Science, Shahid RajaeeTeacher Training University, Tehran, 16785 – 136, I R. Iran
Department of Mathematics, Faculty of Science, Shahid RajaeeTeacher Training University, Tehran, 16785 – 136, I R. Iran
A Cayley graph can be consider as an interpretation of group representation. This means that one can construct the Cayley graph Г = Cay(G, S) by having the vertex set to be the elements of G with g~h if and only if hg-1 ε S. In this paper, we focus our attention on Cayley graphs with a normal symmetric subset. We also determine all eigenvalues of Buckminster fullerene by constructing Cay(G,S) where G is the alternating group A5.
http://jmathnano.sru.ac.ir/article_477_166922038b274bc7128566c1e2ce4b98.pdf
eigenvalue
Cayley graph
characteristic polynomial
eng
Shahid Rajaee Teacher Training University
Journal of Mathematical Nanoscience
2538-2314
2538-2314
2014-06-01
4
1-2
13
18
10.22061/jmns.2014.478
478
Augmented eccentric connectivity index of Fullerenes
Reza Sharafdini
sharafdini@gmail.com
1
Department of Mathematics, Faculty of Science, Persian Gulf University
Fullerenes are carbon-cage molecules in which a number of carbon atoms are bonded in a nearly spherical configuration. The augmented eccentric connectivity index of graph G is defined as £(G)=∑u εV(G)M(u)ε(u)-1, where ε(u) is defined as the length of a maximal path connecting u to another vertex of G and M(u) denotes the product of degrees of all eighbors of vertex u. In the present paper , we compute the augmented eccentric connectivity index of two classes of fullerenes C12n+2 and C20n+40.
http://jmathnano.sru.ac.ir/article_478_800b8677745303e8ee086eaa27425650.pdf
Augmented eccentric connectivity index
eccentricity
Fullerene graphs
eng
Shahid Rajaee Teacher Training University
Journal of Mathematical Nanoscience
2538-2314
2538-2314
2014-06-01
4
1-2
19
25
10.22061/jmns.2014.479
479
Differences between Wiener and modified Wiener indices
Mardjan Hakimi-Nezhaad
m_hakimi20@yahoo.com
1
Modjtaba Ghorbani
mghorbani@srttu.edu
2
Department of Mathematics, Faculty of Science, Shahid Rajaee Teacher Training University, Tehran, 16785 – 136, I R. Iran
Department of Mathematics, Faculty of Science, Shahid Rajaee Teacher Training University, Tehran, 16785 – 136, I R. Iran
The Wiener index is the oldest topological index introduced by H. Wiener for anticipating the boiling point of Paraffin and some other alkenes. An algebraic approach for generalizing the Wiener index is proposed by Graovac and Pisanski for the first time. In this paper, we compute the difference between these topological indices for a class of fullerene graphs.
http://jmathnano.sru.ac.ir/article_479_3b5f1f807f52f598f7054c36fd451058.pdf
Wiener index
Molecular graph
automorphism of graph
eng
Shahid Rajaee Teacher Training University
Journal of Mathematical Nanoscience
2538-2314
2538-2314
2014-06-01
4
1-2
27
36
10.22061/jmns.2014.481
481
Computing the energy of small fullerenes
Tayebeh Ghorbani
1
Institute of Nanoscience and Nanotechnology, University of Kashan, 8731751167 Kashan, I. R Iran
The concept of energy of graph is defined in 1978 by Ivan Gutman as the sum of the absolute values of the eigenvalues of a graph. In this article we estimate the energy of small fullerenes.
http://jmathnano.sru.ac.ir/article_481_ad953d6c600cc97fbb128a5a439ce631.pdf
eigenvalue
fullerene
graph energy
eng
Shahid Rajaee Teacher Training University
Journal of Mathematical Nanoscience
2538-2314
2538-2314
2014-06-01
4
1-2
37
44
10.22061/jmns.2014.482
482
On the Zagreb indices of overfull molecular graphs
Maryam Jalali-Rad
1
Department of Pure Mathematics, Faculty of Mathematical Sciences, University of Kashan, Kashan, I. R. Iran
Let G be a connected graph on n vertices. An overfull graph is a graph whose number of its edges is greater than Δ × [n/2], where Δ is the maximum degree of vertices in G. In this paper, we compute the Zagreb indices of overfull molecular graphs.
http://jmathnano.sru.ac.ir/article_482_989e2f8c1e53a06f95bc290282b465f4.pdf
overfull graph
Zagreb indices
Molecular graph
eng
Shahid Rajaee Teacher Training University
Journal of Mathematical Nanoscience
2538-2314
2538-2314
2014-06-18
4
1-2
45
50
10.22061/jmns.2014.668
668
Spectral properties of some matrices related to topological indices
Samaneh Zangi
1
Department of Mathematics, Faculty of Science, Shahid Rajaee Teacher Training University, Tehran, 16785 – 136, I R. Iran
A topological index is a kind of molecular descriptor which anticipates some properties of chemical compound. The aim of this paper is to compute the spectrum of PA adjacency matrix associated to a well-known topological index.
http://jmathnano.sru.ac.ir/article_668_e939142adc188a0351eb71391bf9ea23.pdf
spectrum of graph
topological index
adjacency matrix