Abstract
Graphs derived from groups are a widely studied class of graphs, motivated by their highly symmetric structure. In particular, G-graphs offer an easy and interesting alternative construction of semi-symmetric graphs. After recalling the main properties of these graphs, this papers gives an extended characterisation of G-graphs and develops the link between bipartite G-graphs and incidence graphs. It appears that these two classes of graphs have a wide overlapping despite having completely different constructions. We give partial answers to the problem of finding which complete simple graphs have a G-graph as their incidence graph.
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