Approximately counting independent sets in bipartite graphs via graph containers
Approximately counting independent sets in bipartite graphs via graph containers
复制标题
通过图容器近似计算二分图中的独立集
DOI:
10.1137/1.9781611977073.24
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发表时间:
2022
期刊:
影响因子:
--
通讯作者:
Potukuchi, Aditya
中科院分区:
文献类型:
--
作者:
Jenssen, Matthew;Perkins, Will;Potukuchi, Aditya
By implementing algorithmic versions of Sapozhenko's graph container methods, we give new algorithms for approximating the number of independent sets in bipartite graphs. Our first algorithm applies to d$$ d $$‐regular, bipartite graphs satisfying a weak expansion condition: when d$$ d $$ is constant, and the graph is a bipartite Ω(log2d/d)$$ \Omega \left({\log}^2d/d\right) $$‐expander, we obtain an FPTAS for the number of independent sets. Previously such a result for d>5$$ d>5 $$ was known only for graphs satisfying the much stronger expansion conditions of random bipartite graphs. The algorithm also applies to weighted independent sets: for a d$$ d $$‐regular, bipartite α$$ \alpha $$‐expander, with α>0$$ \alpha >0 $$ fixed, we give an FPTAS for the hard‐core model partition function at fugacity λ=Ω(logd/d1/4)$$ \lambda =\Omega \left(\log d/{d}^{1/4}\right) $$. Finally we present an algorithm that applies to all d$$ d $$‐regular, bipartite graphs, runs in time expOn·log3dd$$ \exp \left(O\left(n\cdotp \frac{\log^3d}{d}\right)\right) $$, and outputs a (1+o(1))$$ \left(1+o(1)\right) $$‐approximation to the number of independent sets.
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DOI:
10.1016/j.jctb.2021.07.005
发表时间:
2021
期刊:
Series B
影响因子:
--
作者:
Davies, Ewan;Jenssen, Matthew;Perkins, Will
通讯作者:
Perkins, Will
DOI:
--
发表时间:
2001
期刊:
影响因子:
--
作者:
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通讯作者:
A. A. Sapozhenko
DOI:
--
发表时间:
2021
期刊:
Encyclopedic Dictionary of Archaeology
影响因子:
--
作者:
Brigitte Wirtz;Christoph Maggioni
通讯作者:
Christoph Maggioni
DOI:
--
发表时间:
2010
期刊:
2010 IEEE 25th Annual Conference on Computational Complexity
影响因子:
--
作者:
A. Kolla
通讯作者:
A. Kolla
影响因子:
1.1
作者:
Serge Gaspers;Edward J. Lee
通讯作者:
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