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• W2896640993 abstract "A semitotal dominating set of a graph $G$ with no isolated vertex is a dominating set $D$ of $G$ such that every vertex in $D$ is within distance two of another vertex in $D$. The minimum size $gamma_{t2}(G)$ of a semitotal dominating set of $G$ is squeezed between the domination number $gamma(G)$ and the total domination number $gamma_{t}(G)$. textsc{Semitotal Dominating Set} is the problem of finding, given a graph $G$, a semitotal dominating set of $G$ of size $gamma_{t2}(G)$. In this paper, we continue the systematic study on the computational complexity of this problem when restricted to special graph classes. In particular, we show that it is solvable in polynomial time for the class of graphs with bounded mim-width by a reduction to textsc{Total Dominating Set} and we provide several approximation lower bounds for subclasses of subcubic graphs. Moreover, we obtain complexity dichotomies in monogenic classes for the decision versions of textsc{Semitotal Dominating Set} and textsc{Total Dominating Set}. Finally, we show that it is $mathsf{NP}$-complete to recognise the graphs such that $gamma_{t2}(G) = gamma_{t}(G)$ and those such that $gamma(G) = gamma_{t2}(G)$, even if restricted to be planar and with maximum degree at most $4$, and we provide forbidden induced subgraph characterisations for the graphs heriditarily satisfying either of these two equalities." @default.
• W2896640993 created "2018-10-26" @default.
• W2896640993 creator A5022905636 @default.
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• W2896640993 date "2018-10-16" @default.
• W2896640993 modified "2023-09-27" @default.
• W2896640993 title "Semitotal Domination: New hardness results and a polynomial-time algorithm for graphs of bounded mim-width." @default.
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