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On local antimagic chromatic number of graphs with cut-vertices. (English) Zbl 07880374

Summary: An edge labeling of a connected graph \(G = (V, E)\) is said to be local antimagic if it is a bijection \(f:E \rightarrow \{1,\dots,|E|\}\) such that for any pair of adjacent vertices \(x\) and \(y\), \(f^+(x) \neq f^+(y)\), where the induced vertex label \(f^+(x)= \sum f(e)\), with \(e\) ranging over all the edges incident to \(x\). The local antimagic chromatic number of \(G\), denoted by \(_{\chi_{la}}(G)\), is the minimum number of distinct induced vertex labels over all local antimagic labelings of \(G\). In this paper, the sharp lower bound of the local antimagic chromatic number of a graph with cut-vertices given by pendants is obtained. The exact value of the local antimagic chromatic number of many families of graphs with cut-vertices (possibly given by pendant edges) are also determined. Consequently, we partially answered Problem 3.1 in [S. Arumugam et al., Graphs Comb. 33, No. 2, 275–285 (2017; Zbl 1368.05124)].

MSC:

05C78 Graph labelling (graceful graphs, bandwidth, etc.)
05C15 Coloring of graphs and hypergraphs
05C75 Structural characterization of families of graphs

Citations:

Zbl 1368.05124

References:

[1] S. Arumugam, Y. C. Lee, K. Premalatha, T. M. Wang, On Local Antimagic Vertex Coloring for Corona Products of Graphs, (2018), arXiv:1808.04956v1.
[2] S. Arumugam, K. Premalatha, M. Bača, A. Semaničová-Feňovčíková, Local Antimagic Vertex Coloring of a Graph, Graphs and Combin., 33, (2017), 275-285. · Zbl 1368.05124
[3] G. C. Lau, H. K. Ng, W. C. Shiu, Affirmative Solutions on Local Antimagic Chromatic Number, Graphs and Combin., 36, (2020), 1337-1354. · Zbl 1458.05230
[4] G. C. Lau, W. C. Shiu, H. K. Ng, On Local Antimagic Chromatic Number of Cycle-related Join Graphs, Discuss. Math. Graph Theory, 41, (2021), 133-152. · Zbl 1470.05141
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[6] J. Haslegrave, Proof of a Local Antimagic Conjecture, Discrete Math. Theor. Comput. Sci., 20(1), (2018). https://doi.org/10.23638/DMTCS-20-1-18 · Zbl 1401.05260 · doi:10.23638/DMTCS-20-1-18
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