Abstract
Let G = (V, E) be a connected graph. For a vertex subset \({S\subseteq V}\), G[S] is the subgraph of G induced by S. A cycle C (a path, respectively) is said to be an induced cycle (path, respectively) if G[V(C)] = C (G[V(P)] = P, respectively). The distance between a vertex x and a subgraph H of G is denoted by \({d(x, H)=\min\{d(x,y)\ |\ y\in V(H)\}}\), where d(x, y) is the distance between x and y. A subgraph H of G is called 2-dominating if d(x, H) ≤ 2 for all \({x\in V(G)}\). An induced path P of G is said to be maximal if there is no induced path P′ satisfying \({V(P)\subset V(P')}\) and \({V(P')\setminus V(P)\neq \emptyset}\). In this paper, we assume that G is a connected claw-free graph satisfying the following condition: for every maximal induced path P of length p ≥ 2 with end vertices u, v it holds:
Under this assumption, we prove that G has a 2-dominating induced cycle and G is Hamiltonian.
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J. Feng is an associate member of “Graduiertenkolleg: Hierarchie und Symmetrie in mathematischen Modellen (DFG)” at RWTH Aachen, Germany.
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Feng, J. Hamiltonian cycles and 2-dominating induced cycles in claw-free graphs. Math Meth Oper Res 69, 343–352 (2009). https://doi.org/10.1007/s00186-008-0263-4
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DOI: https://doi.org/10.1007/s00186-008-0263-4