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Some Extremal Graphs with Respect to Permanental Sum

Some Extremal Graphs with Respect to Permanental Sum Let G be a graph and A(G) the adjacency matrix of G. The polynomial $$\pi (G,x)=\mathrm {per}(xI-A(G))$$ π ( G , x ) = per ( x I - A ( G ) ) is called the permanental polynomial of G, and the permanental sum of G is the summation of the absolute values of the coefficients of $$\pi (G,x)$$ π ( G , x ) . In this paper, we give some upper and lower bounds for the permanental sum among spiro hexagonal chains, and the corresponding extremal graphs are determined. Furthermore, we investigate the more general result about permanental sum. We obtain a lower bound for the permanental sum of bipartite graphs and the corresponding extremal graphs are also determined. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Bulletin of the Malaysian Mathematical Sciences Society Springer Journals

Some Extremal Graphs with Respect to Permanental Sum

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References (33)

Publisher
Springer Journals
Copyright
Copyright © 2018 by Malaysian Mathematical Sciences Society and Penerbit Universiti Sains Malaysia
Subject
Mathematics; Mathematics, general; Applications of Mathematics
ISSN
0126-6705
eISSN
2180-4206
DOI
10.1007/s40840-018-0642-9
Publisher site
See Article on Publisher Site

Abstract

Let G be a graph and A(G) the adjacency matrix of G. The polynomial $$\pi (G,x)=\mathrm {per}(xI-A(G))$$ π ( G , x ) = per ( x I - A ( G ) ) is called the permanental polynomial of G, and the permanental sum of G is the summation of the absolute values of the coefficients of $$\pi (G,x)$$ π ( G , x ) . In this paper, we give some upper and lower bounds for the permanental sum among spiro hexagonal chains, and the corresponding extremal graphs are determined. Furthermore, we investigate the more general result about permanental sum. We obtain a lower bound for the permanental sum of bipartite graphs and the corresponding extremal graphs are also determined.

Journal

Bulletin of the Malaysian Mathematical Sciences SocietySpringer Journals

Published: Jun 4, 2018

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