Packing bipartite graphs with covers of complete bipartite graphs

Packing bipartite graphs with covers of complete bipartite graphs
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用完整二分图的覆盖来包装二分图

DOI:
10.1016/j.dam.2012.08.026
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发表时间:
2014
影响因子:
1.1
通讯作者:
Chalopin J
Chalopin J
中科院分区:
数学3区
文献类型:
--
作者:
Chalopin J

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对于图的集合S,图G的完美S-填充(S-因子)是G的一组顶点不相交的子图,每个子图同构于S的一个成员,并且它们包含G的所有顶点。如果G允许图H的覆盖(局部双射同态),即顶点映射f:VG → VH满足f(u)f(v)属于EH的性质,只要边uv属于EG,使得对任意u∈ VG,f到u的邻域的限制是双射的,则G是H-覆盖。对于某个固定的H,设S(H)由所有连通的H-覆盖组成。设Kk,k是划分类分别为k和k的完全二部图.对于所有固定的k,n ≥ 1,我们确定了测试给定二部图是否有完美S(Kk,n)-填充问题的计算复杂性.我们的技术部分是基于探索伪覆盖的密切关系。从图G到图H的伪覆盖是从G到H的同态,当限制到G的一个生成子图时,该同态成为到H的覆盖。我们解决了一个问题的计算复杂性,这个问题是问一个图是否允许一个伪覆盖到Kk,k ≥ 1。
For a set S of graphs, a perfect S-packing (S-factor) of a graph G is a set of mutually vertex-disjoint subgraphs of G that each are isomorphic to a member of S and that together contain all vertices of G. If G allows a covering (locally bijective homomorphism) to a graph H, ie, a vertex mapping f: V G→ V H satisfying the property that f (u) f (v) belongs to E H whenever the edge u v belongs to E G such that for every u∈ V G the restriction of f to the neighborhood of u is bijective, then G is an H-cover. For some fixed H let S (H) consist of all connected H-covers. Let K k, ℓ be the complete bipartite graph with partition classes of size k and ℓ, respectively. For all fixed k, ℓ≥ 1, we determine the computational complexity of the problem that tests whether a given bipartite graph has a perfect S (K k, ℓ)-packing. Our technique is partially based on exploring a close relationship to pseudo-coverings. A pseudo-covering from a graph G to a graph H is a homomorphism from G to H that becomes a covering to H when restricted to a spanning subgraph of G. We settle the computational complexity of the problem that asks whether a graph allows a pseudo-covering to K k, ℓ for all fixed k, ℓ≥ 1.
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