Strong Subgraph Connectivity of Digraphs: A Survey
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In this survey we overview known results on the strong subgraph k-connectivity and strong subgraph k-arc-connectivity of digraphs. After an introductory section, the paper is divided into four sections: basic results, algorithms and complexity, sharp bounds for strong subgraph k-(arc-)connectivity, minimally strong subgraph (k, ℓ)-(arc-) connected digraphs. This survey contains several conjectures and open problems for further study.
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