Polynomially determine if a graph is (s, 3)-supereulerian

Polynomially determine if a graph is (s, 3)-supereulerian
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多项式确定图是否是 (s, 3)-超欧拉图

DOI:
10.1016/j.disc.2021.112601
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发表时间:
2021-12
影响因子:
0.8
通讯作者:
Hong-Jian Lai
Hong-Jian Lai
中科院分区:
数学3区
文献类型:
--
作者:
Wei Xiong;Sulin Song;Hong-Jian Lai

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对整数s≥ 0和t≥ 0,图G是(s,t)-超欧勒图,如果对任意不交边集X,Y ∈ E(G),|X| ≤ s且|Y| ≤ t,G有一个包含X且避开Y的生成闭迹。Pulleyblank在1979年证明了判定一个图是否是(0,0)-超欧勒图,即使是平面图,也是NP-完全的。本文研究了使得每个j(s,t)-边连通图都是(s,t)-超欧莱雅图的最小整数j(s,t)的值,证明了当0≤ s≤ 1时,j(s,t)={max <${4,t+ 2};当(s,t)∈ {(2,2),(3,1)}时,j(s,t)∈{(2,0),(2,1),(3,0)},5,s+ t+ 1−(− 1)s 2,如果s≥ 2且s+ t≥ 5。作为应用,我们得到了当t≥ 3时(s,t)-超欧勒图的边连通性的一个刻画,并证明了当t≥ 3时,存在一个多项式时间算法来判定一个图是否是(s,t)-超欧勒图.
For integers s≥ 0 and t≥ 0, a graph G is (s, t)-supereulerian if for any disjoint edge sets X, Y⊆ E (G) with| X|≤ s and| Y|≤ t, G has a spanning closed trail that contains X and avoids Y. Pulleyblank in 1979 showed that determining whether a graph is (0, 0)-supereulerian, even when restricted to planar graphs, is NP-complete. We investigate the value of the smallest integer j (s, t) such that every j (s, t)-edge-connected graph is (s, t)-supereulerian, and show that j (s, t)={max⁡{4, t+ 2} if 0≤ s≤ 1, or (s, t)∈{(2, 0),(2, 1),(3, 0)}, 5 if (s, t)∈{(2, 2),(3, 1)}, s+ t+ 1−(− 1) s 2 if s≥ 2 and s+ t≥ 5. As applications, we obtain a characterization of (s, t)-supereulerian graphs when t≥ 3 in terms of edge-connectivities, and show that when t≥ 3, there exists a polynomial time algorithm to determine if a graph is (s, t)-supereulerian.
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