Generating Cut Conjunctions in Graphs and Related Problems
Generating Cut Conjunctions in Graphs and Related Problems
复制标题
生成图中的割连词及相关问题
DOI:
10.1007/s00453-007-9111-9
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发表时间:
2008
期刊:
影响因子:
1.1
通讯作者:
K. Makino
中科院分区:
文献类型:
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作者:
L. Khachiyan;E. Boros;K. Borys;Khaled M. Elbassioni;V. Gurvich;K. Makino
Abstract
Let G=(V,E) be an undirected graph, and let B⊆V×V be a collection of vertex pairs. We give an incremental polynomial time algorithm to generate all minimal edge sets X⊆E such that every pair (s,t)∈B of vertices is disconnected in (V,E∖X), generalizing well-known efficient algorithms for generating all minimal s-t cuts, for a given pair s,t of vertices. We also present an incremental polynomial time algorithm for generating all minimal subsets X⊆E such that no (s,t)∈B is a bridge in (V,X∪B). Both above problems are special cases of a more general problem that we call generating cut conjunctions for matroids: given a matroid M on ground set S=E∪B, generate all minimal subsets X⊆E such that no element b∈B is spanned by E∖X. Unlike the above special cases, corresponding to the cycle and cocycle matroids of the graph (V,E∪B), the more general problem of generating cut conjunctions for vectorial matroids turns out to be NP-hard.
DOI:
--
发表时间:
2006
期刊:
SIAM Journal on Discrete Mathematics 19
影响因子:
--
作者:
L.Khachiyan;E.Boros;K.Elbassioni;V.Gurvich;K.Makino
通讯作者:
K.Makino