Geodesic
Trees with Distinguishing Index Equal Distinguishing Number Plus One
Discussiones Mathematicae. Graph Theory, Tome 40 (2020) no. 3, pp. 875-884

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The distinguishing number (index) D(G) (D′ (G)) of a graph G is the least integer d such that G has an vertex (edge) labeling with d labels that is preserved only by the trivial automorphism. It is known that for every graph G we have D′ (G) ≤ D(G) + 1. In this note we characterize finite trees for which this inequality is sharp. We also show that if G is a connected unicyclic graph, then D′ (G) = D(G).
Keywords: automorphism group, distinguishing index, distinguishing number, tree, unicyclic graph 
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Alikhani, Saeid; Klavžar, Sandi; Lehner, Florian; Soltani, Samaneh. Trees with Distinguishing Index Equal Distinguishing Number Plus One. Discussiones Mathematicae. Graph Theory, Tome 40 (2020) no. 3, pp. 875-884. http://geodesic.mathdoc.fr/item/DMGT_2020_40_3_a11/