The Sigma Coindex of Graph Operations | Zendy

Yaşar Nacaroğlu | Zendy

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The Sigma Coindex of Graph Operations

Author(s) -

Yaşar Nacaroğlu

Publication year - 2021

Publication title -

journal of mathematics

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 0.252

H-Index - 13

eISSN - 2314-4785

pISSN - 2314-4629

DOI - 10.1155/2021/5534444

Subject(s) - mathematics , cartesian product , graph , sigma , vertex (graph theory) , tensor product , lexicographical order , combinatorics , product (mathematics) , discrete mathematics , pure mathematics , geometry , physics , quantum mechanics

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.

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