Constructible graphs and pursuit
Constructible graphs and pursuit
复制标题
可构造的图表和追踪
DOI:
10.1016/j.tcs.2022.07.023
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发表时间:
2022
影响因子:
1.1
通讯作者:
Ivan M
中科院分区:
文献类型:
--
作者:
Ivan M
A (finite or infinite) graph is called constructible if it may be obtained recursively from the one-point graph by repeatedly adding dominated vertices. In the finite case, the constructible graphs are precisely the cop-win graphs, but for infinite graphs the situation is not well understood.One of our aims in this paper is to give a graph that is cop-win but not constructible. This is the first known such example. We also show that every countable ordinal arises as the rank of some constructible graph, answering a question of Evron, Solomon and Stahl. In addition, we give a finite constructible graph for which there is no construction order whose associated domination map is a homomorphism, answering a question of Chastand, Laviolette and Polat.Lehner showed that every constructible graph is a weak cop win (meaning that the cop can eventually force the robber out of any finite set). Our other main aim is to investigate how this notion relates to the notion of ‘locally constructible’ (every finite graph is contained in a finite constructible subgraph). We show that, under mild extra conditions, every locally constructible graph is a weak cop win. But we also give an example to show that, in general, a locally constructible graph need not be a weak cop win. Surprisingly, this graph may even be chosen to be locally finite. We also give some open problems.
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影响因子:
0.9
作者:
N. Polat
通讯作者:
N. Polat
DOI:
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发表时间:
2009
期刊:
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影响因子:
--
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1995
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影响因子:
--
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2016
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影响因子:
--
作者:
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通讯作者:
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DOI:
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发表时间:
2002
期刊:
Discret. Math.
影响因子:
--
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通讯作者:
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