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Neighborhood unions and cyclability of graphs

机译:图的邻域联合和可循环性

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摘要

A graph G is said to be cyclable if for each orientation G-vector of G, there exists a set S of vertices such that reversing all the arcs of G-vector with one end in S results in a hamiltonian digraph. Let G be a 3-connected graph of order n≥36. In this paper, we show that if for any three independent vertices x_1, x_2 and x_3, |N(x_1)∪N(x_2)|+|N(x_2)∪N(x_3)|+|N(x_3)∪N(x_1)|≥2n+1, then G is cyclable.
机译:如果对于G的每个方向G-矢量,存在一组顶点S,从而使G-vector的所有圆弧都反转为S,则得到G的循环,则认为G是可循环的。令G为n≥36的三连通图。在本文中,我们表明如果对于任何三个独立顶点x_1,x_2和x_3,| N(x_1)∪N(x_2)| + | N(x_2)∪N(x_3)| + | N(x_3)∪N (x_1)|≥2n+ 1,则G是可循环的。

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