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Keywords:
digraphs; characterization; radius of a digraph; a digraph minimal (critical, maximal) by radius; induced subgraph
digraphs; characterization; radius of a digraph; a digraph minimal (critical, maximal) by radius; induced subgraph
Summary:
We define digraphs minimal, critical, and maximal by three types of radii. Some of these classes are completely characterized, while for the others it is shown that they are large in terms of induced subgraphs.
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