On complexity of substructure connectivity and restricted connectivity of graphs

Huazhong Lü; Tingzeng Wu

doi:10.1016/j.jpdc.2026.105237

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arXiv · 2110.05917

On complexity of substructure connectivity and restricted connectivity of graphs

Huazhong Lü·Tingzeng Wu

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Abstract

The connectivity of a graph is an important parameter to evaluate its reliability. $k$-restricted connectivity (resp. $R^h$-restricted connectivity) of a graph $G$ is the minimum cardinality of a set $S$ of vertices in $G$, if exists, whose deletion disconnects $G$ and leaves each component of $G-S$ with more than $k$ vertices (resp. $\delta(G-S)\geq h$). In contrast, structure (substructure) connectivity of $G$ is defined as the minimum number of vertex-disjoint subgraphs whose deletion disconnects $G$. As generalizations of the concept of connectivity, structure (substructure) connectivity, restricted connectivity and $R^h$-restricted connectivity have been extensively studied from the combinatorial point of view. Very little is known about the computational complexity of these variants, except for the recently established NP-completeness of $k$-restricted edge-connectivity. In this paper, we prove that the problems of determining structure, substructure, restricted, and $R^h$-restricted connectivity are all NP-complete.

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Huazhong Lü, Tingzeng Wu. 2021-10-10. On complexity of substructure connectivity and restricted connectivity of graphs. https://doi.org/10.1016/j.jpdc.2026.105237

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