Defines Engel digraphs on groups, proves every finite digraph is an induced subdigraph of some Engel digraph, and classifies finite non-Engel groups whose co-Engel induced subgraphs have clique number at most 4 and are toroidal or projective.
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Engel and co-Engel graphs of finite groups
Defines Engel digraphs on groups, proves every finite digraph is an induced subdigraph of some Engel digraph, and classifies finite non-Engel groups whose co-Engel induced subgraphs have clique number at most 4 and are toroidal or projective.