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http://dx.doi.org/10.14400/JDC.2022.20.2.345

Using Tabu Search for L(2,1)-coloring Problem of Graphs with Diameter 2  

Kim, SoJeong (Department of Applied Mathematics, Kongju National University)
Kim, ChanSoo (Department of Applied Mathematics, Kongju National University)
Han, KeunHee (Department of Applied Mathematics, Kongju National University)
Publication Information
Journal of Digital Convergence / v.20, no.2, 2022 , pp. 345-351 More about this Journal
Abstract
For simple undirected graph G=(V,E), L(2,1)-coloring of G is a nonnegative real-valued function f : V → [0,1,…,k] such that whenever vertices x and y are adjacent in G then |f(x)-f(y)|≥ 2 and whenever the distance between x and y is 2, |f(x)-f(y)|≥ 1. For a given L(2,1)-coloring c of graph G, the c-span is λ(c) = max{|c(v)-c(v)||u,v∈V}. L(2,1)-coloring number λ(G) = min{λ(c)} where the minimum is taken over all L(2,1)-coloring c of graph G. In this paper, based on Harary's Theorem, we use Tabu Search to figure out the existence of Hamiltonian Path in a complementary graph and confirmed that if λ(G) is equal to n(=|V|).
Keywords
L(2,1)-coloring; L(2,1)-coloring number; Graph with diameter 2; Complement graph; Tabu Search;
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