A family of optimal identifying codes in Z(2)



: Honkala I

Publisher: ACADEMIC PRESS INC ELSEVIER SCIENCE

: 2006

: Journal of Combinatorial Theory, Series A

: JOURNAL OF COMBINATORIAL THEORY SERIES A

: J COMB THEORY A

: 113

: 8

: 1760

: 1763

: 4

: 0097-3165

DOI: https://doi.org/10.1016/j.jcta.2006.03.011(external)


Assume that G = (V, E) is a simple undirected graph, and C is a nonempty subset of V. For every upsilon is an element of V, we denote I-r(upsilon) = {u is an element of C vertical bar d(G) (u, upsilon) <= r}, where d(G) (u, upsilon) denotes the number of edges on any shortest path between u and v. If the sets Ir(v) for V E V are pairwise different, and none of them is the empty set, we say that C is an r-identifying code in G. If C is r-identifying in every graph G' that can be obtained by adding and deleting edges in such a way that the number of additions and deletions together is at most t, the code C is called t-edge-robust. Let K be the graph with vertex set Z(2) in which two different vertices are adjacent if their Euclidean distance is at most root 2. We show that the smallest possible density of a 3-edge-robust code in K is r+1/2r+1 for all r > 2. (c) 2006 Elsevier Inc. All rights reserved.



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