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- W4362598693 abstract "If $X$ is a subset of vertices of a graph $G$, then vertices $u$ and $v$ are $X$-visible if there exists a shortest $u,v$-path $P$ such that $V(P)cap X subseteq {u,v}$. If each two vertices from $X$ are $X$-visible, then $X$ is a mutual-visibility set. The mutual-visibility number of $G$ is the cardinality of a largest mutual-visibility set of $G$ and has been already investigated. In this paper a variety of mutual-visibility problems is introduced based on which natural pairs of vertices are required to be $X$-visible. This yields the total, the dual, and the outer mutual-visibility numbers. We first show that these graph invariants are related to each other and to the classical mutual-visibility number, and then we prove that the three newly introduced mutual-visibility problems are computationally difficult. According to this result, we compute or bound their values for several graphs classes that include for instance grid graphs and tori. We conclude the study by presenting some inter-comparison between the values of such parameters, which is based on the computations we made for some specific families." @default.
- W4362598693 created "2023-04-06" @default.
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- W4362598693 date "2023-04-03" @default.
- W4362598693 modified "2023-09-28" @default.
- W4362598693 title "Variety of mutual-visibility problems in graphs" @default.
- W4362598693 doi "https://doi.org/10.48550/arxiv.2304.00864" @default.
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