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Proyecciones (Antofagasta)

Print version ISSN 0716-0917

Proyecciones (Antofagasta) vol.38 no.2 Antofagasta June 2019 


Further results on 3-product cordial labeling

P. Jeyanthi1 

A. Maheswari2 

M. Vijayalakshmi3 

1Govindammal Aditanar College for Women, Department of Mathematics, Research Centre, Tiruchendur - 628 215, Tamil Nadu, India. e-mail:

2Kamaraj College of Engineering and Technology, Department of Mathematics, Virudhunagar - 626 001, Tamil Nadu, India. e-mail:

3Dr. G. U. Pope College of Engineering, Department of Mathematics, Sawyerpuram, Thoothukudi District, Tamil Nadu, India. e-mail:


A mapping f : V (G) → {0, 1, 2} is called 3-product cordial labeling if |vf(i) − vf(j)| ≤ 1 and |ef(i) − ef(j)| ≤ 1 for any i, j ∈ {0, 1, 2}, where vf(i) denotes the number of vertices labeled with i, ef(i) denotes the number of edges xy with f(x)f(y) ≡ i(mod 3). A graph with 3-product cordial labeing is called 3-product cordial graph. In this paper we establish that switching of an apex vertex in closed helm, double fan, book graph K1,n × K2 and permutation graph P (K2 + mK1, I) are 3-product cordial graphs.

Key Words: Cordial labeling; Product cordial labeling; 3-product cordial labeling; 3-product cordial graph.

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Received: November 2015; Accepted: November 2018

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