On Polynomial Kernels for Structural Parameterizations of Odd Cycle Transversal
On Polynomial Kernels for Structural Parameterizations of Odd Cycle Transversal
复制标题
奇循环横截面结构参数化的多项式核
DOI:
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发表时间:
2011
期刊:
影响因子:
--
通讯作者:
Stefan Kratsch
中科院分区:
文献类型:
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作者:
B. Jansen;Stefan Kratsch
The Odd Cycle Transversal problem (OCT) asks whether a given graph can be made bipartite (i.e., 2-colorable) by deleting at most l vertices. We study structural parameterizations of OCT with respect to their polynomial kernelizability, i.e., whether instances can be efficiently reduced to a size polynomial in the chosen parameter. It is a major open problem in parameterized complexity whether Odd Cycle Transversal admits a polynomial kernel when parameterized by l.
On the positive side, we show a polynomial kernel for OCT when parameterized by the vertex deletion distance to the class of bipartite graphs of treewidth at most w (for any constant w); this generalizes the parameter feedback vertex set number (i.e., the distance to a forest).
Complementing this, we exclude polynomial kernels for OCT parameterized by the distance to outerplanar graphs, conditioned on the assumption that NP ⊈ coNP/poly. Thus the bipartiteness requirement for the treewidth w graphs is necessary. Further lower bounds are given for parameterization by distance from cluster and co-cluster graphs respectively, as well as for Weighted OCT parameterized by the vertex cover number (i.e., the distance from an independent set).
DOI:
10.1016/j.tcs.2013.01.029
发表时间:
2013
期刊:
Theor. Comput. Sci.
影响因子:
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作者:
J. Uhlmann;M. Weller
通讯作者:
M. Weller