New infinite family and sporadic distance-biregular graphs from hyperovals and Mathon perp systems, with a non-existence theorem for 225+60 vertex graphs.
Maximal arcs in Desargue- sian planes of odd order do not exist
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New Constructions of Distance-Biregular Graphs
New infinite family and sporadic distance-biregular graphs from hyperovals and Mathon perp systems, with a non-existence theorem for 225+60 vertex graphs.