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IRJET - Skolem Minkowski-4 Mean Labeling of Graphs
1.
International Research Journal
of Engineering and Technology (IRJET) e-ISSN: 2395-0056 Volume: 07 Issue: 04 | Apr 2020 www.irjet.net p-ISSN: 2395-0072 © 2020, IRJET | Impact Factor value: 7.34 | ISO 9001:2008 Certified Journal | Page 823 Skolem Minkowski-4 Mean Labeling of Graphs M.Kaaviya Shree1, K.Sharmilaa2 1II M.Sc Mathematics, Department of Mathematics (PG), PSGR Krishnammal College for Women, Coimbatore, Tamilnadu, India 2Assistant Professor, Department of Mathematics (PG), PSGR Krishnammal College for Women, Coimbatore, Tamilnadu, India ---------------------------------------------------------------------***---------------------------------------------------------------------- Abstract - Let be an simple and undirected graph with vertices and edges. Let us define a function is called Skolem Minkowski-4 Mean Labeling of a graph G if we could able to label the vertices with distinct elements from such that it induces an edge labeling defined as, ⌈ ( ) ⌉ is distinct for all edges (i,e.) It indicates that, distinct vertex labeling induces a distinct edge labeling on the graph. The graph which admits Skolem Minkowski-4 Mean Labeling is called a Skolem Minkowski-4 Mean Graph. In this paper, we have investigated the Skolem Minkowski-4 Mean Labeling of some standard graphs like Path, Comb, Caterpillar, , etc. Key Words: Skolem Minkowski-4 Mean Labeling, Skolem Minkowski-4 Mean Graph, Path, Comb, Caterpillar, . 1. INTRODUCTION The graph we used here are simple, finite and undirected graphs. and denotes the vertex set and edge set of a graph . For graph theoretic terminology, we refer to Harary.F [3], Douglas B. West [1] and Gallian.J.A [2]. The concept of Mean Labeling of graphs was introduced by Somasundaram.S and Ponraj.R [5] in 2003. Sandhya.S.S, Somasundaram.S and Anusa.S [7] introduced the concept of Root Square Mean Labeling of graphs in 2014. V.Balaji, D.S.T.Ramesh and A.Subramanian [4] introduced the concept of Skolem Mean Labeling in 2007. On the same lines we define and study Skolem Minkowski-4 Mean Labeling of graphs. 2. BASIC DEFINITIONS The following definitions are needed for the present study. A. Definition A walk in which all the vertices say are distinct is called a Path. A Path is denoted by . The Path has vertices and edges. B. Definition The graph attained by attaching a single pendent edge to each vertex of a Path is called Comb. Generally, it has vertices and edges. C. Definition A tree which yields a Path when its pendant vertices are removed is called a Caterpillar. It has vertices and edges. D. Definition The is a graph attained by attaching the complete bipartite graph to each vertex of the path . It has vertices and edges. 3. MAIN RESULTS Theorem: 1 Path is a Skolem Minkowski-4 Mean graph for every Proof: Let be a path of length . The path has vertices and edges. Let us define a function by Then the induced edge labels are, Then we attain a distinct edge labels. Therefore, is a Skolem Minkowski-4 Mean graph. Figure 1: Theorem: 2 For every , Comb is a Skolem Minkowski-4 Mean Graph . Proof: Let be a comb attained from a path by attaching each vertex to a
2.
International Research Journal
of Engineering and Technology (IRJET) e-ISSN: 2395-0056 Volume: 07 Issue: 04 | Apr 2020 www.irjet.net p-ISSN: 2395-0072 © 2020, IRJET | Impact Factor value: 7.34 | ISO 9001:2008 Certified Journal | Page 824 pendent vertex .The gragh has vertices and edges. Let us define a function by { { Then the induced edge labels are, Then we attain a distinct edge labels. Therefore, is a Skolem Minkowski-4 Mean graph. Figure 2: Theorem: 3 Let be a graph attained by joining a pendant edges to both sides of each vertex of a path . Then is a Skolem Minkowski-4 Mean graph. Proof: Let us consider a graph which is attained by attaching a pendant edges to both sides of each vertex of a path . Let be a path . Let and be the pendant vertices adjacent to . The gragh has vertices and edges. Let us define a function by { { Then the induced edge labels are, Then we attain a distinct edge labels. Therefore, is a Skolem Minkowski-4 Mean graph. Figure 3: Caterpillar Theorem: 4 is a Skolem Minkowski-4 Mean graph, for every n. Proof: Let be a graph attained by attaching each vertex of to the central vertex of the complete bipartite graph . Let be a path and be the vertices of , which are attached to the vertex of .The gragh contains 3 vertices and 3 edges. Let us define a function by { { Then the induced edge labels are, Then we attain a distinct edge labels. Therefore, is a Skolem Minkowski-4 Mean graph.
3.
International Research Journal
of Engineering and Technology (IRJET) e-ISSN: 2395-0056 Volume: 07 Issue: 04 | Apr 2020 www.irjet.net p-ISSN: 2395-0072 © 2020, IRJET | Impact Factor value: 7.34 | ISO 9001:2008 Certified Journal | Page 825 Figure 4: Theorem: 5 Let be a graph attained by attaching at each pendant vertex of a comb. Then admits a Skolem Minkowski-4 Mean graph. Proof: Let be a graph attained by attaching at each pendant vertex of a comb. The gragh has 3 vertices and 3 edges. Let us define a function by { { Then the induced edge labels are, Then we attain a distinct edge labels. Therefore, is a Skolem Minkowski-4 Mean graph. Figure 5: 4. CONCLUSION In this paper, we have introduced the notion of Skolem Minkowski-4 Mean Labeling and studied for some standard graphs. Illustrative examples are provided to support our investigation. REFERENCES [1] Douglas B.West, Introduction to Graph Theory, Second Edition, PHI Learning Private Limited (2009). [2] Gallian.J.A, A Dynamic Survey of Graph Labeling, The Electronic Journal of combinatorics(2013). [3] Harary.F, Graph Theory, Narosa publishing House, New Delhi. [4] Balaji.V, Ramesh.D.S.T and Subramanian.A, “Skolem Mean Labeling”, Bullentin of Pure and Applied Sciences, vol. 26E No.2, 2007,245-248. [5] Ponraj.R and Somasundaram.S, “Mean Labeling of graphs,” in National Academy of Science Letters, vol.26, pp.210-213, 2003. [6] Sandhya.S.S, Somasundaram.S and Anusa.S, “Root Square Mean Labeling of Graphs,” International Journal of Contemporary Mathematical Sciences, Vol.9, 2014,no. 667-676. [7] Sandhya.S.S, Somasundaram.S and Anusa.S, “Some More Results on Root Square Mean Labeling of Graphs,” Journal of Mathematics Research, Vol.7, No.1;2015. [8] Sandhya.S.S, Somasundaram.S and Anusa.S, “Root Square Mean Labeling of Some New Disconnected Graphs,”International Journal of Mathematics Trends and Technology, volume 15, number 2,2014.page no:85-92.
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