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arxiv 2502.11522 v1 pith:FFOR3I7I submitted 2025-02-17 math.CO

Fan's condition for completely independent spanning trees

classification math.CO
keywords treesspanningcompletelyindependentconditiongraphprovedquestion
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Spanning trees $T_1,T_2, \dots,T_k$ of $G$ are $k$ completely independent spanning trees if, for any two vertices $u,v\in V(G)$, the paths from $u$ to $v$ in these $k$ trees are pairwise edge-disjoint and internal vertex-disjoint. Hasunuma proved that determining whether a graph contains $k$ completely independent spanning trees is NP-complete, even for $k = 2$. Araki posed the question of whether certain known sufficient conditions for hamiltonian cycles are also also guarantee two completely independent spanning trees? In this paper, we affirmatively answer this question for the Fan-type condition. Precisely, we proved that if $G$ is a connected graph such that each pair of vertices at distance 2 has degree sum at least $|V(G)|$, then $G$ has two completely independent spanning trees.

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