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On Edge Irregular Reflexive Labeling of Categorical Product of Two Paths

Muhammad Javed Azhar Khan1, Muhammad Ibrahim1,*, Ali Ahmad2
1 Centre for Advanced Studies in Pure and Applied Mathematics, Bahauddin Zakariya University, Multan, Pakistan
2 College of Computer Science and Information Technology, Jazan University, Jazan, Saudi Arabia
* Corresponding Author: Muhammad Ibrahim. Email:

Computer Systems Science and Engineering 2021, 36(3), 485-492.

Received 19 October 2020; Accepted 13 November 2020; Issue published 18 January 2021


Among the huge diversity of ideas that show up while studying graph theory, one that has obtained a lot of popularity is the concept of labelings of graphs. Graph labelings give valuable mathematical models for a wide scope of applications in high technologies (cryptography, astronomy, data security, various coding theory problems, communication networks, etc.). A labeling or a valuation of a graph is any mapping that sends a certain set of graph elements to a certain set of numbers subject to certain conditions. Graph labeling is a mapping of elements of the graph, i.e., vertex and/or edges to a set of numbers (usually positive integers), called labels. If the domain is the vertex-set or the edge-set, the labelings are called vertex labelings or edge labelings respectively. Similarly, if the domain is V (G)[E(G), then the labeling is called total labeling. A reflexive edge irregular k-labeling of graph introduced by Tanna et al.: A total labeling of graph such that for any two different edges ab and a'b' of the graph their weights has ωtχ(ab) = χ(a) + χ(ab) + χ(b) and ωtχ(a'b') = χ(a') + χ(a'b') + χ(b') are distinct. The smallest value of k for which such labeling exist is called the reflexive edge strength of the graph and is denoted by res(G). In this paper we have found the exact value of the reflexive edge irregularity strength of the categorical product of two paths Pa × Pb for any choice of a ≥ 3 and b ≥ 3.


Edge irregular reflexive labeling; reflexive edge strength; categorical product of two paths

Cite This Article

M. Javed Azhar Khan, M. Ibrahim and A. Ahmad, "On edge irregular reflexive labeling of categorical product of two paths," Computer Systems Science and Engineering, vol. 36, no.3, pp. 485–492, 2021.


This work is licensed under a Creative Commons Attribution 4.0 International License , which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
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