The Sigma Coindex of Graph Operations

Yasar Nacaroglu and Ali Jaballah

Journal of Mathematics, 2021, vol. 2021, 1-8

Abstract: The sigma coindex is defined as the sum of the squares of the differences between the degrees of all nonadjacent vertex pairs. In this paper, we propose some mathematical properties of the sigma coindex. Later, we present precise results for the sigma coindices of various graph operations such as tensor product, Cartesian product, lexicographic product, disjunction, strong product, union, join, and corona product.

Date: 2021
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Persistent link: https://EconPapers.repec.org/RePEc:hin:jjmath:5534444

DOI: 10.1155/2021/5534444

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