On the Complexity of Graph Covering Problems
On the Complexity of Graph Covering Problems
复制标题
关于图覆盖问题的复杂性
DOI:
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发表时间:
1998
期刊:
影响因子:
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通讯作者:
J. A. Telle
中科院分区:
文献类型:
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作者:
Jan Kratochvíl;A. Proskurowski;J. A. Telle
For a fixed graph H, the H-cover problem asks whether an input graph G allows a degree preserving mapping f : V(G) → V(H) such that for every υ ∈ V(G), f(NG(υ)) = NH(f(υ)). In this paper we design efficient algorithms for certain graph covering problems according to two basic techniques. The first is based in part on a reduction to the 2-SAT problem. The second technique exploits necessary and sufficient conditions for the partition of a graph into 1-factors and 2-factors. For other infinite classes of graph covering problems we derive NP- completeness results by reductions from graph coloring problems. We illustrate this methodology by classifying the complexity of all H-cover problems defined by simple graphs H with at most 6 vertices.